Did propane tanks switch the way the threads go?

Answer 1

tanks that are used for flammable gases have left handed threads so that you can only use the proper regulators that control the flow out of the tank

Answer 2

Yes, there was a change in the threading of propane tanks in 1996. Before 1996, propane tanks used a left-handed thread, but after this change, they started using a right-handed thread to make them more standardized and safer.

Answer 3

On most modern tanks the outside threads are normal, but the threads on the inside are reversed. This is the case with most 20lb grill tanks, other propane tank sizes may be different.

Answer 4

So that you're forced to use fittings intended for propane, and don't start mixing in Plumbing parts which might cause an accident.