---
product_id: 6446448
title: "RectorSeal Safe-T-Switch 97637 Condensate Overflow Switch, Easy Access, Condensate Drain Shut Off System, Magnetic Reed Switch, HVAC, Includes 3/4\" Adapter"
brand: "rectorseal"
price: "$70.05"
currency: USD
in_stock: true
reviews_count: 11
category: "Rectorseal"
url: https://www.desertcart.us/products/6446448-rectorseal-safe-t-switch-97637-condensate-overflow-switch-easy-access
store_origin: US
region: United States of America
---

# Adjustable float for quick maintenance access 3/4" adapter for versatile, easy installation Magnetic reed switch for precise overflow detection RectorSeal Safe-T-Switch 97637 Condensate Overflow Switch, Easy Access, Condensate Drain Shut Off System, Magnetic Reed Switch, HVAC, Includes 3/4" Adapter

**Brand:** rectorseal
**Price:** $70.05
**Availability:** ✅ In Stock

## Summary

> 💡 Stay cool, stay safe — never miss a drip with Safe-T-Switch!

## Quick Answers

- **What is this?** RectorSeal Safe-T-Switch 97637 Condensate Overflow Switch, Easy Access, Condensate Drain Shut Off System, Magnetic Reed Switch, HVAC, Includes 3/4" Adapter by rectorseal
- **How much does it cost?** $70.05 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/6446448-rectorseal-safe-t-switch-97637-condensate-overflow-switch-easy-access)

## Best For

- rectorseal enthusiasts

## Why This Product

- Trusted rectorseal brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Trusted HVAC Safety:** RectorSeal quality trusted by pros for reliable condensate monitoring
- • **Compact & Space-Smart:** L-shaped design fits tight spaces without compromising performance
- • **Effortless Installation:** Fits auxiliary drain outlets with included 3/4" adapter—no plumbing hassle
- • **Maintenance Made Simple:** Adjustable float and quick-access design streamline servicing
- • **Precision Overflow Protection:** Automatically shuts off A/C to prevent costly water damage

## Overview

The RectorSeal Safe-T-Switch 97637 is a professional-grade condensate overflow switch designed to detect clogged A/C drain lines and automatically shut off the system to prevent water damage. Featuring a magnetic reed switch and adjustable float, it installs easily on auxiliary drain outlets using the included 3/4" adapter. Its compact L-shaped design fits tight spaces, while quick-access features simplify maintenance. Trusted by HVAC professionals, this switch operates on 24V AC circuits and ensures your cooling system stays protected from costly condensate overflows.

## Description

Product Description Detects clogged air conditioner condensate drain and shuts off the system. Using the 3/4" adapter the SS2 can be installed on the auxiliary outlet of the primary drain pan. The SS2 can be installed on the auxiliary outlet of the primary drain pan. Condensate overflow magnetic reed switch allows it to be installed off-center and still function correctly. Float is adjustable; quick access to the switch allows for easy service; easy primary drain line access for service. Float switch will not detect clogs upstream from installation point; switch is only for use in water; 24 volt ac 1.25 amp; 3/4" adapter included. FOR THE TRADESMAN: RectorSeal is recognized as a leading provider of quality solutions for the professional trades serving heating, ventilation, and air conditioning (HVAC/R), plumbing, electrical, and construction markets. From the Manufacturer Safe-T-Switch SS2 is a smaller, L-Shaped switch installs on auxiliary pan outlets and requires no plug. Installs easily in tight spaces and catches clogs in primary pan outlet nipples. Pre-wired with 4-foot 18 AWG wires. (24-Piece).

Review: good safety for A/C - This is a typical safety switch and is used to shut off an A/C unit when the evaporator condensate drain is clogged. The Rectorseal brand is a common brand. It is usually installed on the secondary drain port on the indoor evaporator coil or the air handler. It has a float that opens a switch so you wire it in series to the yellow thermostat wire (24 volt wire) to shut off the outdoor compressor if it senses the evaporator pan is overflowing. I like to pressure fit the PVC connection so you can remove it from the coil instead of glueing it in place. The pipe size is 3/4". I would use a different type float switch (clamp-on type) on the emergency drain pan under the furnace or air handler. I think it is better used close to the evaporator because a condensate leak will leak through a furnace and ruin a main circuit board or even a blower motor before a lower emergency pan float switch shuts off the air conditioner. Remember it is for 24 volt circuits. Install it "inline" or in series on the thermostat wire that energizes the compressor- usually the yellow"Y" wire. This means the blower (G(reen))wire will still run. Make sure you install it level with the evaporator on the secondary drain port which is slightly HIGHER then the main drain port on a evaporator which should already have a white PVC pipe connected. Do not disable this safety- fix the clogged pipe - use a wet vacuum on the condensate drain pipe outside that usually works. You can also cut the drainline near the indoor coil and use pressurized nitrogen to blow out a clog then use a 3/4" PVC coupling to reconnect the drainline. Make sure to clear the pipe going into the coil as well. All air handlers should have a PVC ptrap on the drain pipe this keeps the blower from drawing air in through that drainline and possibly keeping the drain from draining. On a regular gas furnace the indoor coil is on the "positive" side of the blower so it doesn't need the p-trap -(it blows a little air outward through that drainline). Sometimes the secondary drain port on the evaporator has a plug or a plastic knockout I carefully use a drill bit to drill through the knockout without damaging the threads. This threaded connection just needs to be hand tightened plus maybe a 1/2 turn don't overtight these drain connections on the coil as the pan is usually plastic and can crack. Use tfe paste or teflon tape on the threads. You should be able to lift the float assembly out of the elbow to clean it when needed. The quality of this product is good and it is a simple product. You can easily test it like any switch using a volt meter while the outdoor compressor is running it should have 24 volts between either of the wire leads to ground. With the switch open (overflow position) one lead would read 24 volts and the other lead 0 volts to ground- that is while thermostat is "calling for" the compressor to run. Some service techs install this on the 24 volt red wire which will switch off all the 24 volts to the thermostat just have to trace the 24 volt wiring to know. A furnace or airhandler in an attic should always have a emergency drain pan under it on the floor and that pan should always stay dry except if there is a problem. Shut off the unit if that emergency pan has water in it until the leak is fixed. This switch is used mostly if the unit is in a closet or in the garage or basement and can be used along with the emergency pan. Almost all Air conditioner drains clog up eventually. A heat pump doesn't produce condensate in the indoor section in the heating (winter) mode just in the A/C (summer) mode.
Review: Exact replacement - Perfect replacement for a faulty AC unit that loved to trigger an alarm at 2am. I picked up two of these to future proof any issues. A simple snip and splice of the wires and we are back up and running. Perfect for our need and a great value considering the alternative is a 2am alarm.

## Features

- APPLICATION: Detects clogged air conditioner condensate drain and shuts off the system; using the 3/4" adapter the SS2 can be installed on the auxiliary outlet of the primary drain pan
- EASY INSTALLATION: The SS2 can be installed on the auxiliary outlet of the primary drain pan; condensate overflow magnetic reed switch allows it to be installed off-center and still function correctly
- EASY MAINTENANCE: The SS2 float is adjustable and allows for quick access to the switch allows for easy service; easy primary drain line access for service
- SPECIFICATIONS: Detects clogged a/c condensate drain and shuts off the system, using the 3/4" adapter the ss2 can be installed on the auxiliary outlet of the primary drain pan; switch is only for use in water; 24 volt ac 1.25 amp; 3/4" adapter included
- FOR THE TRADESMAN: RectorSeal is recognized as a leading provider of quality solutions for the professional trades serving heating, ventilation, and air conditioning (HVAC/R), plumbing, electrical, and construction markets

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B005D4RFEM |
| Actuator Type | Magnetic Reed |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #109,104 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #221 in Electrical Outlet Switches |
| Brand | Rectorseal |
| Circuit Type | 1-way |
| Color | White |
| Compatible Devices | HVAC devices (Air Conditioners, Heat Pumps, Furnaces) |
| Connectivity Protocol | X-10 |
| Connector Type | Plug In |
| Contact Material | Plastic |
| Contact Type | Normally Closed |
| Control Method | Touch |
| Control Type | Water Level |
| Current Rating | 250 Amps |
| Customer Reviews | 4.7 4.7 out of 5 stars (1,628) |
| Date First Available | July 17, 2011 |
| Global Trade Identification Number | 00021449976374 |
| International Protection Rating | IP53 |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 7.4 ounces |
| Item dimensions L x W x H | 2 x 5.5 x 8.25 inches |
| Item model number | 97637 |
| Lower Temperature Rating | 25 Degrees Fahrenheit |
| Manufacturer | Rectorseal |
| Mounting Type | Wall Mount |
| Number of Items | 1 |
| Number of Positions | 2 |
| Operating Voltage | 110 Volts |
| Operation Mode | ON-ON |
| Part Number | 97637 |
| Product Dimensions | 2 x 5.5 x 8.25 inches |
| Size | 3/4" |
| Style | Switch |
| Terminal | Solder |
| UPC | 021449976374 |
| Unit Count | 1.0 Count |
| Upper Temperature Rating | 125 Degrees Fahrenheit |
| Usage | personal |
| Wattage | 30 watts |

## Product Details

- **Brand:** Rectorseal
- **Connector Type:** Plug In
- **Contact Type:** Normally Closed
- **Current Rating:** 250 Amps
- **Item dimensions L x W x H:** 2 x 5.5 x 8.25 inches
- **Material:** Plastic
- **Operating Voltage:** 110 Volts
- **Operation Mode:** ON-ON
- **Switch Type:** Reed Switch
- **Terminal:** Solder

## Images

![RectorSeal Safe-T-Switch 97637 Condensate Overflow Switch, Easy Access, Condensate Drain Shut Off System, Magnetic Reed Switch, HVAC, Includes 3/4" Adapter - Image 1](https://m.media-amazon.com/images/I/41mRBpnQU9L.jpg)
![RectorSeal Safe-T-Switch 97637 Condensate Overflow Switch, Easy Access, Condensate Drain Shut Off System, Magnetic Reed Switch, HVAC, Includes 3/4" Adapter - Image 2](https://m.media-amazon.com/images/I/510GT+wogxL.jpg)
![RectorSeal Safe-T-Switch 97637 Condensate Overflow Switch, Easy Access, Condensate Drain Shut Off System, Magnetic Reed Switch, HVAC, Includes 3/4" Adapter - Image 3](https://m.media-amazon.com/images/I/51DnC1pw9-L.jpg)
![RectorSeal Safe-T-Switch 97637 Condensate Overflow Switch, Easy Access, Condensate Drain Shut Off System, Magnetic Reed Switch, HVAC, Includes 3/4" Adapter - Image 4](https://m.media-amazon.com/images/I/51ULSY6xLdL.jpg)
![RectorSeal Safe-T-Switch 97637 Condensate Overflow Switch, Easy Access, Condensate Drain Shut Off System, Magnetic Reed Switch, HVAC, Includes 3/4" Adapter - Image 5](https://m.media-amazon.com/images/I/51p4fZU71mL.jpg)

## Questions & Answers

**Q: on  the ss2 safety switch does it have a normally open contact or is it normally closed?**
A: The switch is normally closed. When water raises the float this opens the connection. These float switches go bad every so often. In the case where the switch has gone bad and you are sure you do not have condensate clog in your line, you can cut the wire at the top of switch and twist together the wire to the unit and cover with a wire nut. You are going to have the switch replaced anyway, so you might as well enjoy your A/C without paying for an emergency visit from your local HVAC professional. Do this only if you are 100% sure you do not have a clogged line. I take no responsibility if your line is clogged and you suffer water damage.

**Q: Can this be put into a secondary drain pan that sits under the ac?**
A: I don't see why not.  Just make sure you have the wiring set up correctly to shut down the unit.  I assume there is another switch in the primary drain pan.

**Q: Can the float level be adjusted, by rotating the float shaft on a thread(?), or ?**
A: No, I don't believe it is adjustable.  Since it is designed as a type of safety switch (to turn off AC unit) there isn't a need to adjust.

**Q: What is the inside diameter of the pipe that the switch slides into? Does the switch use a float?**
A: 3/4 inch id. switch does use a float

## Customer Reviews

### ⭐⭐⭐⭐⭐ good safety for A/C
*by D***G on October 30, 2022*

This is a typical safety switch and is used to shut off an A/C unit when the evaporator condensate drain is clogged. The Rectorseal brand is a common brand. It is usually installed on the secondary drain port on the indoor evaporator coil or the air handler. It has a float that opens a switch so you wire it in series to the yellow thermostat wire (24 volt wire) to shut off the outdoor compressor if it senses the evaporator pan is overflowing. I like to pressure fit the PVC connection so you can remove it from the coil instead of glueing it in place. The pipe size is 3/4". I would use a different type float switch (clamp-on type) on the emergency drain pan under the furnace or air handler. I think it is better used close to the evaporator because a condensate leak will leak through a furnace and ruin a main circuit board or even a blower motor before a lower emergency pan float switch shuts off the air conditioner. Remember it is for 24 volt circuits. Install it "inline" or in series on the thermostat wire that energizes the compressor- usually the yellow"Y" wire. This means the blower (G(reen))wire will still run. Make sure you install it level with the evaporator on the secondary drain port which is slightly HIGHER then the main drain port on a evaporator which should already have a white PVC pipe connected. Do not disable this safety- fix the clogged pipe - use a wet vacuum on the condensate drain pipe outside that usually works. You can also cut the drainline near the indoor coil and use pressurized nitrogen to blow out a clog then use a 3/4" PVC coupling to reconnect the drainline. Make sure to clear the pipe going into the coil as well. All air handlers should have a PVC ptrap on the drain pipe this keeps the blower from drawing air in through that drainline and possibly keeping the drain from draining. On a regular gas furnace the indoor coil is on the "positive" side of the blower so it doesn't need the p-trap -(it blows a little air outward through that drainline). Sometimes the secondary drain port on the evaporator has a plug or a plastic knockout I carefully use a drill bit to drill through the knockout without damaging the threads. This threaded connection just needs to be hand tightened plus maybe a 1/2 turn don't overtight these drain connections on the coil as the pan is usually plastic and can crack. Use tfe paste or teflon tape on the threads. You should be able to lift the float assembly out of the elbow to clean it when needed. The quality of this product is good and it is a simple product. You can easily test it like any switch using a volt meter while the outdoor compressor is running it should have 24 volts between either of the wire leads to ground. With the switch open (overflow position) one lead would read 24 volts and the other lead 0 volts to ground- that is while thermostat is "calling for" the compressor to run. Some service techs install this on the 24 volt red wire which will switch off all the 24 volts to the thermostat just have to trace the 24 volt wiring to know. A furnace or airhandler in an attic should always have a emergency drain pan under it on the floor and that pan should always stay dry except if there is a problem. Shut off the unit if that emergency pan has water in it until the leak is fixed. This switch is used mostly if the unit is in a closet or in the garage or basement and can be used along with the emergency pan. Almost all Air conditioner drains clog up eventually. A heat pump doesn't produce condensate in the indoor section in the heating (winter) mode just in the A/C (summer) mode.

### ⭐⭐⭐⭐⭐ Exact replacement
*by T***E on September 19, 2025*

Perfect replacement for a faulty AC unit that loved to trigger an alarm at 2am. I picked up two of these to future proof any issues. A simple snip and splice of the wires and we are back up and running. Perfect for our need and a great value considering the alternative is a 2am alarm.

### ⭐⭐⭐⭐⭐ Works well.
*by J***S on December 2, 2025*

THe perfect replacement for my air handler drain. It funtions as advertised.

## Frequently Bought Together

- Rectorseal 97637 Safe-T-Switch Ss2
- Rectorseal 97647 Safe-T-Switch Ss3
- Rectorseal 97632 Safe-T-Switch Ss1,Black/ White

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-02-25*