Davey Spa-Quip Reset Button.
This is used on the Pulsar/ 2095 heater elements and it sticks out of the top of the heater dome and sits on the manual rest klixon.
1/2" Spigot to 3/4" Barb
16mm - 27mm Hose Clamp
16mm - 27mm Hose Clamp - Bag of 20
19mm Drain Valve Skin Fitting Only.