Aluminum Cam & Groove Adapter, Inch Dust Plug

For the 4 inch size, the pressure rating is 150 PSI. That applies to all cam and groove couplings in the half inch through 4 inch range. Once you get into the 5 inch to 8 inch sizes, that rating drops to 75 PSI, but you're well within the higher-rated range with this one.

For interchange, it follows the standard A-A-59326 (which supersedes MIL-C-27487F) and also DIN 2828, so a 4 inch size normally interchanges with other cam and groove parts made to those same standards.

That's correct. This aluminum cam and groove adapter is strictly a dust plug designed to keep debris out of your 4-inch cam lock fittings when they're not in use.

The body is cast from aluminum, either A356 or A104 grade. The cam levers are brass, and the pins, rings, and safety clips are plated steel. Seals are Buna-N. For most liquid transfer applications that's a solid material combination, though if you're running something particularly aggressive, the Buna-N seals are usually the first thing worth checking compatibility on for your specific fluid.

For a 4 inch size, the pressure rating is 150 PSI. Interchangeability is based on the A-A-59326 standard or DIN 2828, so it is meant to match other components built to those standards.

This adapter is designed to interchange with products made to A-A-59326 or DIN 2828 standards, so it should fit most standard cam and groove couplers. Just be aware that the 1/2" and 8" sizes might not always be a perfect match with other brands since there isn't a strict standard for those.