Evolution Aqua Essential Series Dual Union Ball Valves, Slip Connections - a better value Size:1" This means a pump must

This means a pump must be used to move water back into the pond

a 5/8" barb and a 1" barb to attach to any of those hose sizes

and attempting to form a watertight seal by overtightening the decorative top plate will result in the plate cracking under extreme pressure

especially for entering into Koi shows

AquaSurge® asynchronous skimmer

Evolution Aqua Essential Series Dual Union Ball Valves, Slip Connections - a better value Size:1" This means a pump mustBall valves are helpful when trying to regulate pump flow or temporarily restrict flow to work on a pump or filter. They allow you to stop back flow completely while disengaging your pump, or to throttle your flow rate down, or direct water through specific lines. Always restrict the flow at the line discharge and never directly at the pump or on the intake side. The Essential Series is a better priced Double Union Ball Valve from the standard OEM