Sealing O-Rings

O-ring Material R-12
H-NBR NBR
(Hydrogenated Nitryl Butadiene Rubber)

NOTE:
The replacement O-rings have an R-134a identification label on the parts package only. Keep the O-ring in the parts package until just before installing to avoid confusion. Do not substitute R-12 parts for R-134a parts, you may damage the A/C system.

Reason for Change The NBR type O-rings used on the R-12 systems will swell and deteriorate rapidly with R-134a refrigerant, causing refrigerant leaks.