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 Fountain Water Pump, 2000L/H, with 7.2ft High Lift, 3 Nozzles for Aquarium, Fish Tank, Pond, Hydroponics, Statuary, Pool

Product ID: 128938920

Details

Brand
GROWNEER
Color
Black
Item Weight
19 Ounces
Material
Plastic
Maximum Flow Rate
33 Liters Per
Maximum Lifting Height
7.2 Feet

⚡30W energy-efficient motor

💧550 GPH max flow

📏7.2 ft max lift height

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VT10154

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Sold byAmazon VanuatuDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💦 Elevate your water game—flow, power, and control in one sleek pump!

POWERFUL EFFICIENT - 30W motor delivers robust 550 GPH flow while keeping energy consumption low—eco-smart and effective.
PRECISION FLOW CONTROL - Adjust water pressure effortlessly with the built-in control knob for perfect aquatic ambiance.
MULTI ENVIRONMENT READY - Ideal for aquariums, ponds, hydroponics, fountains, and pools—boost water circulation and oxygenation with style.
VERSATILE NOZZLE OPTIONS - Three interchangeable nozzles (0.51", 0.62", 0.75") tailor water flow to your unique setup.
SECURE FLEXIBLE INSTALLATION - Four strong suction cups and a 5.9 ft power cord ensure stable, customizable placement anywhere.

The GROWNEER 550GPH Submersible Pump combines a high-efficiency 30W motor with a maximum flow rate of 2000L/H and a 7.2 ft lift height. Featuring three nozzle sizes and adjustable flow control, it offers versatile, energy-saving water circulation for aquariums, ponds, hydroponics, and fountains. Its secure suction cup mounting and long power cord make installation effortless, delivering reliable performance with low noise.

Specifications

ASIN	B07MDBYTLS
Best Sellers Rank	#1,129 in Pet Supplies ( See Top 100 in Pet Supplies ) #2 in Aquarium Water Pumps
Brand Name	GROWNEER
Color	Black
Customer Reviews	4.3 4.3 out of 5 stars (11,510)
Flow Rate	33 Liters Per Minute
Horsepower	30 Watts
Included Components	1 x 0.51" Nozzle, 1 x 0.62" Nozzle, 1 x 0.75" Nozzle, 1 x 550GPH Water Pump
Item Dimensions L x W x H	3.3"L x 2.2"W x 2.7"H
Item Type Name	Submersible Pump
Item Weight	19 Ounces
Manufacturer	GROWNEER
Manufacturer Part Number	WP550-3
Material Type	Plastic
Maximum Lifting Height	7.2 Feet
Model Number	WP550-3
Power Source	ac
Product Style	Submersible
Specific Uses For Product	Outside，inside
UPC	653334368010
Unit Count	1.0 Count
Voltage	110 Volts

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