I have a very old spa and I redid all the plumbing useing the 210-5830 jet body. Both the air and water are 1". There is no marking on the body that tells me which one is air and water. How can I tell which one is which? I actually plumbed it both ways and I have water coming out of the plumbed air line. Maybe this is a bigger problem than which is which.
Thanks.

The air line is the one closest to the face of the jet. Water furthest to the rear. The jet should be oriented with air on top, water on the bottom.