Product Review

Marineland double stopcock water tight valve with quick disconnect is installed just above the filter to regulate flow or so the filter can be disconnected from the tubing. Allow to seal off hoses so one can clean filter without spilling water. Double valve stops water flow from both aquarium and canister filter. Also helps regulate flow from output side of canister. To shut off and disconnect both lines in both directions 2 double disconnect valves needed. Measures 5/8-inch size.