Pressure Switch 1/8" mpt 1 Amp Hot Tub Spa Part Universal How to Video 1 Amp Universal Pressure Switch fits Most Applications Factory Preset Pressure Adjustment Threads measure about 3/8" wide but are called 1/8" MPT See our YouTube Video called "Pressure Switch Flow Code No Heat Spa Hot Tub How To The Spa Guy" Standard Normally Open Style with 2 Tabs