Reliable Pipes And Tubes Ltd manufacturers Steel End Caps. Reliable Pipes and Tubes Ltd is an ISO 9001:2008 certified company. Steel End Caps are applicable for blind pipeline. It also helps to stop flow from one end in a pipeline. Steel End Caps are made from Butt Weld & Socket Weld, Alloy Steel etc. The available classes` are 2000 lbs, 3000 lbs, 6000 lbs, 9000 lbs etc.