Harwil flow switch with transparent Tee for D1 Spas

Flow Switch 1A 3/4" Barb x 1/2" Slip 24" Cord w/2 Pin Connector.

Used on Dimension 1 Spas since it has a socket end on the plastic tee to be glued onto the Laing heater.

If you don't need the plastic assembly, just buy the switch shown below as an accessory.