Replacement microswitch.  
Replacement circuit board. Epoxy sealed connections improve water resistance.
Replacement pump for sprayers. Self-priming diaphragm pump rated for up to 1,000 cycles.
Replacement diaphragm pump and circuit board.
Replacement Viton™ gasket for hose attachment.
Replacement Viton™ gasket for the pump inlet filter.
Replacement Viton™ gasket for tank lid.
Replacement pump inlet filter with a stainless-steel mesh for capturing debris before it reaches the pump.
Replacement cap for the drainage hole in the tank of the 9-gallon sprayers.