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OPD
Over fill
Prevention
Device
It has nothing to do with flow out of cylinder. It prevents over filling the tank. IIRC it limits the capacity to 80%. Before that device was mandated, it was common place to fill a 7 gal cylinder with 7.5 or even 8 gal of LP.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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