Pressure Switch Heater Plug 1/8 Inch NPT IP-18

Pressure switch hole plug for flow through spa heaters is a plastic 1/8 inch NPT plug used to close off the unused pressure switch hole/tap of a spa heater. 

This is the slot version of the plug.  Photo shows front and side view of plug.  Item is a single pressure switch hole plug IP-18.

Plug, for Pressure Switch Hole, Nylon, 1/8"-27 NPT, Slot

Pressure switches should never be bypassed when operating a spa for safety reasons - but if the function is covered elsewhere in the spa plumbing, then this plug will cover the hole in the heater meant for a pressure switch.

69-0050B Replaces the metal plug 6000-124.

Or see stainless steel plug 47-555-1022