Hi will this work on low pressure gravity flow?

According to the listing, water pressure at the valve should be 5-PSI or more (some say 8-PSI.) Pressure created by a gravity system will depend on the configuration of the system. If the water tank is elevated, pressure at ground level will be higher than if the tank is at ground level. The higher the tank, the higher the water pressure at the valve (ground level.) Using a value of 0.433 PSI per foot, it would require the storage tank to be almost 12-feet above the float valve if you need 5-PSI at the valve. If you need 8-PSI at the valve, the tank would need to be closer to 20 feet high. (To supply reasonable pressure for general household use, the water tank would probably need to raised to about 100 feet.)

How do you mount this

It must be mounted in the vertical position. I have 2 of these used on 2 different bulk water tanks. Screw it onto a a threaded pipe and position it at the desired water level. The valve must be solidly secure to work properly (I used a bulk head fitting attached to the accessed lid with a cam lock quick connector) One of the valves has been in use for around 4 years the other 2 years. Hope this helps. Let me know if you have other questions.

I want a 1" Hudson Valve, but in the description it doesn't say this is 1". Can you confirm please

The threads are 1” for sure. I just installed one last week in the trough in my arena. I must say that the newer ones are improved over my older ones. The valve diaphragm will need cleaning periodically because algae and scale will gather inside the valve. The Nelson valve is our best unit compared to others we have used. Very reliable.

It doesn't explain how the unit mounts to the tank?

It doesn't mount to the tank, it threads onto a 3/4" or 1" male fitting. In my case, 1" pipe ran into a fish pond and this valve threaded right on.

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💧 The last float valve you'll ever need—durability meets effortless control!

BUILT TO LAST - Indestructible ABS plastic with no external moving parts means zero breakage and zero downtime.
EFFORTLESS SETUP - Installs in seconds—no tools, no hassle, just plug & play.
VERSATILE MASTERY - Perfect for aquariums, irrigation, livestock tanks, pools, and more—one valve to rule them all.
SPACE SAVVY DESIGN - Compact, sleek, and discreet—fits tight spaces without the bulk of traditional float valves.
PRESSURE PERFECT CONTROL - Operates flawlessly from 5 to 150 psi, ensuring precise water flow every time.

The Hudson Valve 718H is a 1" FNPT float valve crafted from rugged nylon resin, delivering a high flow rate of 5 to 40 GPM. Its innovative design eliminates fragile float balls and levers, making it freeze-resistant, rustproof, and virtually indestructible. Compact and easy to install, it’s engineered for versatile use across aquariums, irrigation, livestock tanks, and more, operating reliably within a 5 to 150 psi pressure range.

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Product Dimensions	12.7 x 9.53 x 12.7 cm; 340.19 g
Part number	718H
Item display length	4 inches
Item display width	4 inches
Item display weight	272 g
Material type	nylon resin
Manufacturer	HORIZON DISTRIBUTION
Item model number	718H
ASIN	B000H5T76Q

Hudson Valve 718H 1" Hudson Float Valve-National Thread, Black, 1 Inch

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