RV supply/repair stores can help you with black pvc
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'95 SMB E350 Quigley 7.3 https://www.taylorarts.com
... If you have to ask, you'll never understand...
"... torpedo'd, because we don't generally cotton to bullshit around here." -jage
"... do they ooch apart in the night?" -Dia
FYI, I think the SMB-installed ones come with a built-in pressure reducer, while the one noted above is simply a pass-through hose connection for filling a tank (from the looks of it).