While going to my daily trip to the Lowes, I saw these air couplers for $2.78 and realized that this would have been cheaper then using all the ball valves. I would have used a lot less fittings and get the same functional purpose of the ball valves (if I set it up correctly).
I’ve used those air couplers – if they’re not kept completely dry, the ball bearings that allow them to disconnect and reconnect will rust, usually siezing them connected. They’re cheap for a reason.
I did not think about a rusting issue, maybe if they sold stainless or something else?
Lowe’s and Home Depot sell the same couplers. They’re not all that bad except for the ball bearings that hold it together, which are poorly chromed steel. If they were stainless steel they’d be pretty good. If you keep them dry and off the floor like you’ve done with your manifold they’ll probably last, but I won’t use ’em again.