Patent ID: 7025175

Claim:
A combination vent mechanism and differential housing containing an oil reservoir and seal for said reservoir comprising; a) an upper vent housing, b) a lower vent housing, said lower vent housing comprising vent holes, c) a diaphragm contained between the upper and the lower vent housings, said diaphragm including a lower contact; d) an upper contact, e) an internal ground, f) a stem, said stem including an aperture open to said oil reservoir, and g) an insulator which electrically insulates the upper vent housing from the lower contact, wherein oil vapor pressure build up in the reservoir is communicated through said aperture to said vent holes in the lower housing to the diaphragm, wherein said diaphragm, after a given pressure level is reached within said vent, moves the lower contact into contact with the upper contact, grounding the vent mechanism to power an indicator informing an operator of said pressure level.