Shoot, I'm still struggling with this. I got a new switch from White Owl but...it's the same switch I already had. I talked to George about it and he said they have successfully moved that same switch over to the air side, BUT it must have a different thread than the normal air upgrade switch? I couldn't find any kind of acceptable TEE fitting at Lowes--not even close. Actually though, I didn't see one like the one pictured on the previous page, either.
I don't see anything on McMaster Carr that looks right. Are these compression fittings?