The Drain Plug for Power WOW is a wet end drain plug for the Pentair Power WOW. This part does not come with an O-ring. The part allows the pump to be drained of stagnant water so protect it from damage and to keep it running for as long as possible.
The pressure switch - MAS400 - is specifically designed to replace the original pressure switches in the Legend Series Master Spas 2000 CS models. Control the water pressure in your spa with the right part.