AIR CONDITIONING METAL LINE-(Inlet Service block w/sight glass) FITS LATE 1977FITS 1978 L48 ONLYFROM BLOCK TO EVAPORATOR TUBE, INCLUDES SIGHT GLASS & SERVICE BLOCK MakeCHEV ModelCORVETTE Year1977-1978 Item#HAC540 Instructions / Core Return FormClick Here Price$69.95EACH Core Charge$0.00 QtyAdd