One draw back. the O-ring AR-10 fittings do not have a recess to capture the O rings allowing them to blow out under high pressure. Fortunately I was intending to use this on the low pressure part of my system. Do Not use this for high pressure fuel injection as the O ring blow out could cause a fire. Will see if the fittings seal well enogh for 5-7 PSI. You can see that the fitting thread into a hole with no ring of recess to capture the O ring.