hi All, Can someone let me know why the O2 through hull shown on page 41 of K350 plans (see attachment) needs to be made like that? Is it just to be removeable? At the end of the day its a through hull with 1/2 inch NPT at each end just like a normal pipe nipple? Whats to stop me just welding in a normal 1/2 inch pipe nipple? Is there is a specific need for the 1/4 inch hole (perhaps oxygen safety)? If so i could just make a 1/2 inch bar with a 1/4 inch hole and weld that in? I cant see the point in that system unless im missing something? Thanks as always James
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