---
product_id: 31776059
title: "KNOWAIR LEG-108-903 Vacuum Breaker Repair Kit"
brand: "legend valve"
price: "$23.10"
currency: USD
in_stock: true
reviews_count: 8
url: https://www.desertcart.us/products/31776059-knowair-leg-108-903-vacuum-breaker-repair-kit
store_origin: US
region: United States of America
---

# Anti-siphon design 1.25" diameter Stainless steel cap KNOWAIR LEG-108-903 Vacuum Breaker Repair Kit

**Brand:** legend valve
**Price:** $23.10
**Availability:** ✅ In Stock

## Summary

> 🔒 Secure Your Water Supply with Confidence!

## Quick Answers

- **What is this?** KNOWAIR LEG-108-903 Vacuum Breaker Repair Kit by legend valve
- **How much does it cost?** $23.10 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/31776059-knowair-leg-108-903-vacuum-breaker-repair-kit)

## Best For

- legend valve enthusiasts

## Why This Product

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

## Key Features

- • **Precision Fit:** Engineered for Legend T-550 and T-550A models, ensuring a perfect match.
- • **Compact Design:** Lightweight at just 2.11 ounces, making it easy to handle and store.
- • **Durable Materials:** Constructed with high-quality stainless steel and robust plastic for long-lasting performance.
- • **Easy Installation:** User-friendly assembly process with clear instructions for hassle-free repairs.
- • **Frost-Free Functionality:** Designed to prevent backflow, keeping your potable water supply safe and clean.

## Overview

The KNOWAIR LEG-108-903 Vacuum Breaker Repair Kit is a specialized solution for maintaining Legend brand frost-free sillcocks, including T-550 and T-550A models. This kit includes essential replacement parts designed to prevent backflow, ensuring the safety of your potable water supply. With durable stainless steel components and a straightforward installation process, this repair kit is a must-have for any homeowner looking to maintain their outdoor plumbing efficiently.

## Description

Legend Valve 108-903 T-550 VACUUM BREAKER REPAIR KIT by Legend Valve

## Features

- Repair kit includes replacement vacuum breaker parts for Legend brand, T-550 and Improved Flow T-550A, anti-siphon frost free sillcocks (i.e. spigot, faucet, hose bib, hose valve). Used on 4", 6", 8", 10", 12" And 14" T550 And T550A. The function of this kit is to prevent water from siphoning back into the potable water Supply (i.e. backflow).
- Included with this kit are: 1 stainless steel cap, 1 body (larger plastic piece with rubber o-ring), and 1 piston (smaller plastic piece). Body measurements: The top (Wider) diameter is 1.25" (1 1/4"). The bottom (Narrower) diameter is .875" (7/8"). The threads are proprietary to Legend brand, and non-standard, therefore they will not fit other sillcock brands.
- How do I identify my sillcock brand, size and model number? Markings for Legend, the size and the model number will be visible on the top of the wheel handle.
- How do I know if my outdoor faucet is frost free? A rule of thumb is that if the faucet has a knob that’s perpendicular to the house, it’s frost–free. The knob turns a long stem that closes a valve inside the house where it’s warm. If the knob is at a 45-degree angle, it’s not frost free. Tip: If your current vacuum breaker has a black cover, this replacement part will not fit.
- For correct assembly: The flat end of the piston goes up inside the smaller diameter end of the body. The prongs/teeth of the piston, should be facing out/downward. As you install the body back into the sillcock valve, the prongs/teeth of the piston should be facing downward towards the valve. Check the alignment before tightening. The stainless steel cap secures the assembly in place. Be sure to tighten with a wrench to prevent leaking.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Legend Valve |
| Part Number | LEG-108-903 |
| Item Weight | 2.11 ounces |
| Product Dimensions | 8 x 1 x 4 inches |
| Item model number | LEG-108-903 |
| Is Discontinued By Manufacturer | No |
| Color | Metal |
| Material | Stainless Steel |
| Item Package Quantity | 1 |
| Included Components | Valve |
| Batteries Included? | No |
| Batteries Required? | No |

## Product Details

- **Brand:** Legend Valve
- **Mounting Type:** Wall Mount
- **Finish Type:** Polished
- **Material:** Stainless Steel
- **Color:** Metal
- **Number of Handles:** 1
- **Included Components:** Valve
- **Special Feature:** Safety Feature: Prevents Backflow
- **Handle Type:** Knob
- **Style:** Industrial

## Images

![KNOWAIR LEG-108-903 Vacuum Breaker Repair Kit - Image 1](https://m.media-amazon.com/images/I/41CKGqtH-CL.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ No more leaks
*by L***N on April 22, 2025*

Easy to install, and fixed my leaking outdoor faucet!

### ⭐⭐⭐⭐⭐ Fit ASSE1019-A 2890 faucet
*by J***E on April 24, 2025*

Perfect fit for my ASSE1019-A 2890 faucet! Neither Home Depot nor Menards had the right size and those were all plastic parts where this had a high quality metal cap. Great price, free shipping it and arrived sooner than expected.Thank you Stanios Industrial Supply!

### ⭐⭐⭐⭐⭐ Worked great
*by B***N on March 26, 2025*

Solved the leak.

## Frequently Bought Together

- KNOWAIR LEG-108-903 Vacuum Breaker Repair Kit
- Homewerks VACVBKX1B Vacuum Breaker Replacement Kit for Traditional Anti-Siphon Frost-Free Sillcock Valves
- Eastman Vacuum Breaker Repair Kit, 45417

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-03-13*