Provides a quick and hassle-free way to connect to a can of R12 or R134A refrigerant, oil, or additive when working on automotive air conditioning systems Built-in, hinged can adapters allow use with multiple can sizes - even the small oil charge cans Tap includes standard male R12 and R134A fittings for easy hook up Schrader valves on fittings prevent leakage and allow for storage of partially used cans Crafted from a durable, super rigid plastic with a metal hinge pin that adds additional strength at this critical location