Pressurized Mating Adapter

Spacecraft docking adapter

A Pressurized Mating Adapter (PMA) is a component used on the International Space Station (ISS) to convert the Common Berthing Mechanism (CBM) interface used to connect ISS modules to an APAS-95 spacecraft docking port. Three PMAs are attached to the US Orbital Segment of ISS. PMA-1 and PMA-2 were launched along with the Unity module in 1998 aboard STS-88; PMA-3 was launched in 2000 aboard STS-92. PMA-1 permanently connects the Unity and Zarya modules. International Docking Adapters were permanently installed on PMA-2 and PMA-3 in 2017 to convert them from the APAS-95 standard to the newer International Docking System Standard (IDSS).

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