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R12, R134a, and R1234yf
Can Taps, Sockets, and Adapters

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New EPA rules require a self-sealing valve on small cans used to recharge a system. The California Air Resources Board (CARB) has also introduced specific regulations on containers holding more than two ounces and less than two pounds of refrigerant by weight and with a Global Warming Potential (GWP) greater than 150.

Traditionally, unused refrigerant was immediately vented into the atmosphere after a recharging process. New self-sealing containers have proven to reduce pollutants but require special attention when it comes to the can tap and adapters. Using the wrong can tap/adapter on a self-sealing valve can destroy the seal, leaking refrigerant or trapping it inside. Both piercing and self-sealing cans are currently in the market, causing practitioners to be careful with their choice of taps/adapters.

The tables below shows can taps, primary seal sockets, and common adapters for R12, R134a, and R1234yf.
*Note that R134a cans require a right hand thread and R1234yf cans  require a left hand thread.

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109_r12_r134a_r1234yf_can_tap_sockets_adapaters.pdf
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