Gems single point level switch. These unit solve the problem of point level sensing in tanks with inaccessible tops or bottoms, or at intermediate locations in larger tanks. Operation is positive and dependable. The float pivots with changing liquid level, displacing a shuttle which magnetically actuates a hermetically sealed switch within the unit. Installation is through the tank side at the detection point. General purpose materials designed to provide reliable service in oils and water. UL Recognized and CSA listed. Explosion-Proof. 316 Stainless steel, beryllium copper, Teflon, ceramic other wetted material. Operating temperature for water is to +180 degree F and for oil is -40 to +250 degree F. 150 psi maximum pressure at 70 degree F. 0.8 Minimum liquid SG. 1/2" Minimum switch differential in liquid.