pb motor tech bmt pb motor tech ac diagnostic manifold gauge set for r134a, r12, r22, r502 refrigerants, includes 4ft three-color hoses and 2 quick couplers - automotive & household ac maintenance is up for auction in Automotive. The current bid is $3.00, 89% below the $26.99 MSRP, in Good Condition. This auction has ended — similar items appear in live auctions regularly.