Firstly they are not produced as shown in the picture! The valve stem is not threaded into the exhaust valve neck. (See photos I've included.) The valve stem portion is only held in place with a VERY small piece of brass thread that only fits 1-2 threads into the body to which sealant has been applied. All 4 I ordered were the same except one actually fell out. (Pictured) I returned all 4 and do not suggest buying any. I bought these to attach to a 4 tire air/lint kit and hoses. If they were made like the pictures show I would use them. They are not built as shown in the photos. I do NOT recommend them.