The assembly consists of a metal tube with a valve that screws onto the pressure gauge and then a hose is screwed onto that tube. I unpacked it and immediately after using it on the front wheel of the bike I noticed that the thread gauge tube was loose. No problem. I added some Loctite and tightened. Well, the hose broke off. It has a spring and two washers (gaskets I think) that spilled on my garage floor. I've been trying to assemble it to make sense (I'm an engineer for what it's worth) but now it's leaking constantly. Total POS without, ZERO, QC.