Lock America offers two types of propane tank locks to help marketers discourage unauthorized fills and prevent tank theft.
A Texas county wants to punish polluters. The state won't let it.
Tank locks address safety, liability, tampering concerns - LP Gas
PROPANE TANK FILL VALVE SECURITY LOCK ANTI-THEFT FOR SUPPLIERS RENTED – Nash Fuel
Fuel Theft Solutions
Oil Tank Accessories Explained - Fuel Tank Shop
Oil & Energy Online :: Lock, Stock & No Shopping Around
Propane Tank Locks Security Valve Locks // Propane Tank Locks - Propane Filler Valve Locks - Propane Locks // Lock America Inc., The Definitive Word in Locks
Outdoor Faucet Lock System -to Prevent Water Theft,Prevent Water Theft by Cover and Code Lock,Stop Unauthorized Water use and Vandalism,Faucet Protection Cover is Easy to Install, Combination Padlocks - Canada
Oil & Energy Online :: Propane Tank Locks Deter Theft and Unauthorized Fills
Empty propane tank with OPD* to protect against overfilling. *OPD : Overfill Prevention Device, (Propane sold separately)
OPD Propane Tank 20 lb
Gas Management Systems System Components Catalogue – ISO Standard