"836 Pressure Controls - General Industrial, Device Style C, External Copper Alloy Bellows, No Enclosure , X140, External Manual reset contact block. Single pole single throw, normally open - contacts open at a predetermined setting on fall and remain open until system is restored to normal conditions at which time contacts can be manually reset."
"836T Pressure Controls - Traditional Machine Tool, T - Style Pressure Control. 75 psi. Enclosure Type 1, 4 and 13 Industrial use.. S.P.D.T. , 2 - circuit contact block. No Modifications, No Modifications, X15, Red LED Pilot Light 24V DC"