Full compliance with the details and intent of API Spec 6A, Annex K, assures field interchangeability with service equipment having API designated collar connections.

WOODCO USA designs allow Back Pressure Valve installation through the Top Connector.

WOODCO USA provides a gall resistant coating on all units regardless of material to reduce field corrosion and prevent galling on sensitive surfaces.

The Collar (Nut) has a course knurled surface and "Tommy Bar" holes to facilitate installation and removal of the Collar.

A spiral retainer ring on the Plug allows the collar to lift the plug when opening the collar connection.