My old foamers were PVC and resided in the ER. Foam was delivered to the bays by 3/4" tubing...Not perfect, but worked...The 1.5" x 10" long PVC foamers had nylon scrubby in each end, hollow in the middle. Made great foam, just took too long to get to the bays. That's why I switched to the 3/4" brass and put them above the bays. The time it takes to get foam to the brush is a lot shorter now. As you can see in the thread I posted, the 3/4" brass pipe still makes good foam.
BTW, it doesn't matter whether you use a Procon or
flojet, they both produce volume and pressure. The key is to deliver the same volume of
soap and air regardless of how many bays are using the FB. Something to consider.