Edgetec External Spa Drain For Cabinet.Hole size required in cabinet is 45mm.Valve inclues cap and has a 22mm socket on the back.Front cap unscrews and pulls out to start flow
Also a tap connector can be purchased to connect a hose to E-4927-50.
Hot Spring 30700 Cap Drain Valve
CMP Spa Drain - Grey
CMP External Spa Drain