A lap-joint flange is comparable to your slip-on, with home with the intersection from the bore as well as flange experience to get a lap stub finish. Threaded metal pipe should be used in superior-safety destinations, because it is more resistant to vandalism, harder to remove, and its scrap worth http://valvesandfittings20306.blogdon.net/detailed-notes-on-valves-and-fittings-11738731