They are all pressure regulators. The first 3 have a fixed pressure setting and the last one is adjustable. The 3rd one has a gauge and it looks like it is on the regulated side not the inlet.
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TV: 2002 Toyota Tundra Acess Cab, TRD, 4WD, LS, Tow Package.
Mods: 7-pin Connector, Tekonsha P3, Reese WDH, Milenco Grand Aeros, Leer cap, FS airbags, RVS backup cam & monitor, front hitch.
TM: 2008 2619, A/C, Swing Tongue, 40 gal Tank, Awning, Cabinet over sink, MW drawer.
Mods: Kumho 875 205/R14s, Shower curtain & Oxygenics, Sewer hose stow, Prop reg on top, (2) Trojan 27TMs w/1+2 switch, Marinco A/C plug, RVS backup cam, Honda EU2000i & companion w/extended run tank.
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