Air pump manufacturers don't seem to be the people who use them. These people are right. The connecting clamp is required for home use, not for professional use. It is great. Like they use pumps. It's very well done. Now we must force the pump manufacturers not to put an analog gauge on a pump that is too underpowered (which is fine on a dial reading 300psi on a pump that doesn't run at 60) and that the gauge is unreadable. it works at close range.