is there a flow chart for differences in head pressure?

the smaller the restriction, the harder the pump will work thus it will overheat. These are not magnetic drives and will not adapt to flow reduction like a brew (aka Riptide) pump. Keep an eye on the heat generated (run in cooler or 5 gal bucket) w/return flow and take water temps over an hour or two. Just restricting the flow will NOT push farther but may make it overheat, use more amps, and then burnout (see user pics of fried extension cords)

What is the pipe thread size of the discharge side of the pump?

It’s actually 0.75 inch thread. I just measured.

Does this have auto shut off?

Auto shutoff for what purpose? Two possibilities would be: A timer would switch it ff and on at prearranged times. For a malfunction due to no water going through, you will ideally want to power it through a ground fault interrupt circuit so in the event the water source accidentally runs dry the pump will not burn out.

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550GPH Submersible Pump 30W Ultra Quiet Fountain Water Pump, 2000L/H, with 7.2ft High Lift, 3 Nozzles for Aquarium, Fish Tank, Pond, Hydroponics, Statuary

Product ID: 267424449

Details

Brand
GROWNEER
Colour
550 GPH
Material
Stainless
Product dimensions
8.4L x 6.5W x
Style
Submersible

⚡30W energy-efficient motor

💧550 GPH max flow

📏7.2 ft max lift height

$92.67

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Description

💦 Elevate your aquatic vibe with power, precision, and peace—because your water deserves the best!

POWERFUL EFFICIENT - 30W motor delivers a robust 550 GPH flow while keeping energy consumption low—eco-friendly and wallet-friendly.
MULTI USE MASTERPIECE - Ideal for aquariums, fountains, hydroponics, and statuary—enhance water circulation and oxygenation to keep your ecosystem thriving.
PRECISION FLOW CONTROL - Adjust water pressure effortlessly with the built-in control knob for the perfect aquatic ambiance.
VERSATILE NOZZLE OPTIONS - Three interchangeable nozzles (0.51"/0.62"/0.75") let you customize water flow to suit any aquarium, pond, or hydroponic setup.
SECURE FLEXIBLE INSTALLATION - Equipped with 4 strong suction cups and a 5.9ft power cord for easy, stable placement anywhere in your aquatic environment.

The GROWNEER 550GPH Submersible Pump combines a high-efficiency 30W motor with a maximum flow rate of 550 gallons per hour and a 7.2-foot lift height. Featuring three nozzle sizes for customizable water flow, a long power cord, and strong suction cups, it’s designed for versatile use in aquariums, ponds, hydroponic systems, and fountains. Its quiet operation and energy-saving design make it a top choice for professionals seeking reliable, adjustable water circulation.

Specifications

ASIN	B07MDBYTLS
Brand Name	GROWNEER
Color	550 GPH
Customer Reviews	4.3 4.3 out of 5 stars (11,105)
Flow Rate	33 Liters Per Minute
Horsepower	30 Watts
Item Dimensions L x W x H	8.4L x 6.5W x 5.8H centimeters
Item Weight	19 Ounces
Manufacturer	GROWNEER
Manufacturer Part Number	WP550-3
Material Type	Stainless Steel
Maximum Lifting Height	7.2 Feet
Model Number	WP550-3
Power Source	Corded Electric
Product Style	Submersible
Specific Uses For Product	Aquariums, Fountains, Hydroponic Systems, Statuary
UPC	653334368010
Unit Count	1.0 Count
Voltage	110 Volts

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