Application: these low/ high side retrofits converts 1/4 inch R12 R22 charging port and accept the R134a quick disconnect hose, fits most vehicles 1976 - 1995, excluding some cars 91 and up. Fits 1987 for Town Car 5.0L, 1991 for Pickup and some other models converted from R-12 to R-134. The low-voltage side is suitable for some household cars, please confirm the model and size before purchasing Function: converts from R-12 to R-134a air conditioning system, this valve can be screwed on top of a closed AC system that just needs a little refrigerant or top off Easy to install: connected to the thread for use with the valve, 1 gas valve inside, fitted with a plastic protective cover Note: Please check as much as possible to make sure the item is what you need. The mention of any and any related model designation above is only for purposes of demonstrating compatibility, not for using. Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Colour:Silver Material:Metal Package Contents: 2 x Low-side 7/16 inch port 2 x High-side 3/8 inch port 4 x Adapters for port W /Anti-dust cap Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.