Inquiry (采购产品): replacement parts im looking for parts to a refrigerant recovery machine. model #615r30p450d403x. date code 0696. made by the gast corp , benton harbor, michigan. the part i need is for the piston. it is a diaphram , unlike the 'o' ring found on other pistons. the unit has worked well , up to 400 hrs of operation. how do i find the parts for this model? **** Hidden Message ***** Duane Miklos 206 Otter St. Bristol, PA 19007 USA Company: Harris Comfort Title: Technician Phone: 215 510 0160 E-mail: pugfanforlife13@aol.com **** Hidden Message ***** pugfanforlife13@aol.com