If the installed 1/2 inch qd fitting doesn't fit your shop, prepare to cut new threads. Installed fitting does NOT have 1/4 NPT (pipe) threads. Luckily the hole size is perfect for the 1/4 NPT thread and in 10 minutes I had the inner tube filled. 1 star as received, 3 stars after change. PS: Remove the sensor before cutting a new thread, otherwise you will ruin the sensor with metal particles.