Product review (5 stars): Perfect fit. The original installers used 5/8" ID drain ...
Perfect fit. The original installers used 5/8" ID drain tubing requiring a small clamp to keep it on the Spud. Over the years it must have been tightened by some unsuspecting furnace technician and cracked the spud tail. I put new 1/2" ID tubing on the spud and no clamp. As we would say in the Air Force after fixing an engine problem, "Works fine, lasts a long time, won't rust bust or collect dust."