All propane tanks must have OPD valves or they will not be refilled
Flame King 5LB Empty Propane Tank LP Cylinder with OPD Valve for Camping and Portable Appliances & Reviews - Wayfair Canada
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How to safely and quickly empty old 1lb propane tank : r/CampingGear
The Flame King 30LB Propane Tank is a pre-purged vacuum ready for filling with propane, avoiding you the cost and headache of purging your new tank.
Flame King YSN330 30LB Steel Propane Tank Cylinder with Gauge and OPD Valve for Grills and BBQs, Camping, Fishing, & Outdoor Activities, White
8 Types of Propane Tanks
Propane Tank, 4# (~1gal)
New Lot of 50 Propane Tank OPD Valves Overfill Protection Device
