Adapter Nut (10050069): 3/8 A Bulb A20DP Differential Pressure Swichgages The latch type is energised

The latch type is energised to latch

The 20T-250-8-1/2 is a 2" Temperature Swichgage

The 20P-75 Pressure Swichgage was specifically designed to protect engines and equipment in oil field

protected against reverse polarity

making the EGS21T-300-12 highly desirable for marine and other environmentally sensitive applications

Adapter Nut (10050069): 3/8 A Bulb A20DP Differential Pressure Swichgages The latch type is energisedThe standard threading size at the end of a temperature gauge capillary tube is 5 8 18 UNF (Union Nut). The inner threads of this 3 8 A Bulb Adapter Nut measure 5 8 18 UNF, to make the correct connection to the stationary end of the temperature gauge capillary tube. The outer threads measure 3 8 18 NPT allowing you to make a non standard connection to match your application, which is generally a connection to the coolant bath of your engine block.