White PVC Swing Check Valves, Female Threaded Ends (FPT) Size:3/4" FPT Other photo shows typical setup

Other photo shows typical setup (requires separate purchase of bulkheads and ball valves)

Overall 18"W x 18"D x 36"H 300lb Chair with Arms Seat 16"W x 17"D x 17"H

since they actually produce more circulation and water movement than airstones

000 gallons (Container treats 96

Remains effective over a wide range of pH conditions

White PVC Swing Check Valves, Female Threaded Ends (FPT) Size:3/4" FPT Other photo shows typical setupCheck valves are essential when using a waterfall filter in conjunction with a pond skimmer. The check valve will prevent water in the filter from back flowing into the skimmer when the pump is switched off and keep water in bogs when the pump is turned off and other purposes. Check valves are also essential when an external pump is being used. The check valve prevents the water from draining back into the pond or reservoir, keeping the external pump