Side can tap makes servicing A/C Systems with 12 oz. R134a & 4 oz. oil charge cans quick & easy. Slides over R134a cans for fast & easy charging. Adapter for A/C oil charge cans included. Easily connects to R134a manifold gauge sets. Brass outlet port offers a 1/2"" ACME & 1/4_ FL fitting with an internal check valve to prevent system backflow