I have an old Sanborn 3.5 hp, 18-gal air compressor with a major leak. Seams to be coming out of the bottom of the combination on/off and pressure switch. Having problems finding a replacement part. Did a Google search on air compressor replacement parts and found five potential sources. None answer e-mails. Anyone know of a source who at least answers the mail? Specific part I need is: Furnas Electric Co., Series C, Cat. No. 69LM109137R, 034-0091, On 90 PSI/Off 120 PSI.