All propane tanks must have OPD valves or they will not be refilled
New Lot of 50 Propane Tank OPD Valves Overfill Protection Device
Manchester Tank & Equipment 30 lb. Steel TC/DOT Vertical Propane Cylinder Equipped with OPD Valve, 1160TCTH.5 at Tractor Supply Co.
Flame King 30LB Empty Steel Propane Tank LP Cylinder with Type 1 OPD Valve, for Grills and BBQs & Reviews - Wayfair Canada
Propane Tank Into Air Tank, the EASY Way : 7 Steps - Instructables
New Lot of 50 Propane Tank OPD Valves Overfill Protection Device
OPD Valve! What is it? - Propane Tank Store
Flame King YSN401a 40 Pound Steel Propane Tank Cylinder with Overflow Protection Device Valve,White : Sports & Outdoors
Overfill Prevention Is a Must for Oil Tanks — How This Works
How much does it cost to refill a propane tank for a grill? - Quora
Steel DOT Vertical LP Gas Cylinder Equipped with OPD Valve, 20 lb. at Tractor Supply Co.