Poorly maintained, rusted, damaged, or old cylinders may need requalification before filling, or may need to be taken out of service. Federal regulations and NFPA 58 require periodic requalification of all small propane (DOT) cylinders. Do not use or have filled any cylinder due for requalification until it has been properly inspected and requalified and the requalification date stamped on it.
Do not attempt to repair your cylinder, cylinder valve, regulator, or appliance. Call your propane gas supplier.