Hello all , just bought a Quickdraw hotpipe and i have noticed there is some in / out free plat where the outet header flange contacts the inner manifold flange. the header manifold only came with 1 x single o - ring but i feel it should have another o - r ing fitted on the other side of header pipe flanged section if you can understand this. so does the quickdraw manifold come with just the one o - ring or does it have 2 o - rings ? thanks guys.