EEZ RV Products does. They sell systems with either flow-thru or non-flow-thru, and systems that have a mix of both kinds. The flow-thru are somewhat fragile, if you overtighten them on the valve stem they fail and have to be replaced. I have learned this the hard way. The flow thru have anti-theft set screws so they can be locked on the stem once mounted. The flow thru are 2 1/4" long and 1" in diameter so they don't work well in some applications, where they stick out too far.
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Randy - Manhattan, Kansas
2015 Vista 27N
2020 Ford Escape Hybrid
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