Our versatile tank reg test adapter has multiple uses in the shop and on the field. Screw a tank reg into the fixture and attach directly to an air source, and you can test a reg for leaks without having to attach and fill a bottle. But the CP tank reg test adapter is so much more than just a tool. Building a machine gun nest for a scenario game? Need an abundant air supply for testing markers in the shop, but don't have easy access to your HPA line? Just attach the CP tank reg tester up to a scuba yoke, screw in a tank regulator, and then use a standard remote line from the tank reg to supply air to your marker. The tank reg will regulate HPA from the scuba to a marker-friendly pressure, allowing you to operate a marker from a scuba tank.