The Hudson Valve’s unique design maintains fluid level in tanks and troughs with an exceptional patented float system. Fluid level forces the float to rise and close the diaphragm chamber, which expands to stop incoming flow. Unlike common ball float valves, the Hudson Valve does not constrict the flow prior to positive shut-off.Valve body parts are made out of a durable glass-filled nylon, which is vented to eliminate siphoning. Rubber shut-off pad and ABS plastic and stainless steel internal parts ensure long life. Each valve comes with installation instructions, warranty information and parts list. Two Year Warranty High Volume – 2400 GPH at 40 PSI Animal Damage-Resistant Design No Float Ball or Moving Parts Unaffected by FreezingHudson Valve for 1–140 PSI with 1" female thread is 5" high and 3.75" in diameter.