This project is an add-on for the Exhaust Steam Injector. I added all four double flanges as part of the check valve even though in reality, of course, the flanges from the check valve and the flanges from the pipe are held together by bolts. This allows simple copper pipe to be used for plumbing the engine. A 7/16 diameter rod is inserted through the check valve. The ½ inch O.D. copper pipe is slipped over the protruding rod on both sides. This gives mechanical support to the finished product since the outside diameter of the check valve between the flanges matches the OD of the copper tubing.

A picture of the actual check valve can be seen above in the Exhaust Steam Injector post.

This is the part done in black, strong and flexible plastic on Shapeway's 3-D printer. The quality is much better than any 3-D printer under $25,000 that JG Conversions can afford for limited use.