I have been doing a lot of residential with one inch valves. I could use the prefabed manifolds, but I have been building them myself with one inch tees. A guy I work with some still sets up a tripod and builds his manifolds with galvanized pipe. I am looking for a better way to build them. Here is how I build them: 1) I chuck up a 1X10" machined nipple in my pipe vise and thread on a valve. 2) I cut the nipple off at 3" with a wheeled tubing cutter so the cut is smooth and even. 3) While the valve is in the vise I thread on a male adaptor. 4) I cement on a 1" tee and use the mold lines to keep it straight. Most go on tees, but I leave about 25% undone to assemble on site in case I need them on ells. 5) Sip of beer here (this is a late night project in my home shop). 6) Cut some one inch schedule 40 to 3 inches with the tube cutter. 7) Another sip of beer 8) When I get to the job site I assemble the manifold with three valves in a standard box and 1 main-line drain in each box. Is there a better way to build from scratch? I really don't like the prefab manifolds.