WaterBlock WB-13 Point-of-Use Excess Water Flow Shut-Off Valve PEX are all fine as

PEX are all fine as long as they are approved in your area)

to protect your incoming water source

Suction pipe: 1-1/4" PVC pipe

you install it in the water line feeding a particular fixture or appliance

you need to be able to fill a 5 gallon bucket within 30 seconds with water from your home's hose spigot

WaterBlock WB-13 Point-of-Use Excess Water Flow Shut-Off Valve PEX are all fine asFor other volume based shutoff systems, see our flow rate based water leak detector category page. Quick Summary Excess water flow shut off valve; Operates automatically. Helps to prevent or minimize water damage from a malfunctioning appliance by shutting off the water flow if its volume becomes excessive. Does not require electric power. All it needs to operate is water flowing through it. For applications that do not exceed 13 gallons per