One regulator is designed for the CGA540 oxygen connection, compatible with most standard oxygen tanks in the U.S., while the other is tailored for the CGA200 acetylene connection, suitable exclusively for MC-type acetylene cylinders.

One regulator is designed for the CGA540 oxygen connection, compatible with most standard oxygen tanks in the U.S., while the other is tailored for the CGA200 acetylene connection, specifically suited for MC-type acetylene cylinders.