– Made up of high graded PVC

– Prevent water from flowing back down

– Allow the pump to pull water up

– Helps in keeping the pipe full of water while the pump is not running

– Used in a suction line of the pumping system in a well

– Prevent back flow thus it is useful at places where suction pipe is at lower than pump height

– Prevent the pump column from draining upon pump shutdown

– Provide a positive sealing action at both low and high pressures without slamming

15 mm to 100 mm