PVC Knife Valves are the most popular choice for OPEN/CLOSE applications and low pressure applications.
PVC Knife Valves are used on the majority of pond filter drains as well as the bottom drain circuts before and after many prefilters.
PVC Knife Valve - 1.5-in. inch Knife Valve
PVC Knife Valve - 2-in. inch Knife Valve
PVC Knife Valve - 3-in. inch Knife Valve
PVC Knife Valve - 4-in. inch Knife Valve
PVC Knife Valve - 6-in. inch Knife Valve
PVC Swing Check Valves
3 Way Valves
PVC Ball Valves