US Hardware - POL Plug w/Strap

I use this with my 5lb propane tank. As others have mentioned, it is almost impossible to get the plug to seat perfectly. It naturally wants to crossthread. Took about ten tries to get it just right, but if you push straight on the plug firmly as you tighten it, it will screw in perfectly. A metal plug would probably be better if you were frequently removing and reinstalling it, but if you set it and forget it, it should work just fine.

I'm using a pair of 100 pound propane cylinders to fuel a greenhouse heater. I ordered the plugs to keep the POL valves clean when I'm transporting the cylinders for refilling. They work fine for that or for storing a spare cylinder and will keep debris out of the valve. Being plastic they are softer than the brass valves so if you cross thread one the plug will be damaged rather than the valve's threads, which is a good thing as the plugs are inexpensive and easily replaceable. Will buy again when I need replacements.

If you coat the plug with some petroleum jelly before counter-clockwise insertion you will not re-thread the plug and can keep on using it as intended when you carry tanks for filing. I had read all the other reviews and I knew what they were doing incorrectly. Sorry no one helped them. These work great.

I received the plug today, it comes with a plastic strap to connect it to the cylinder. There is nothing wrong with it and it will do the intended job and that is plug the opening when I transport the cylinder. My disappointment is it is red and not the yellow as pictured. I have two cylinders and wanted two colors one red and one yellow so it would be a way of knowing which cylinder was in use and which was the backup. I have two red. I ordered two plugs from different sources ( both Amazon ) in an effort to get the two colors. If you need a safety plug for your propane cylinder then this is a good buy. Just don't trust the picture.

Here in the Desert Southwest when Transporting Loose Portable Propane Tanks back to your home on the desert roads; ( The Black Cap To Protect is USELESS!!! ) One Discovers very Fine Dust Particles on the Inside Threads which will be going into the gas regulator. How many Gas Regulators do You want to Buy? You and Yours Have Very Beautiful and Blessed Lives!!!Sincerely,David

great way to keep bugs and dirt out of tanks that are not in use. Used in conjunction with a machine bushing that is painted green on ones side and yellow on the other, I can easily mark full or empty tanks

Just as expected

Purchased from Supreme Hardware. This was not the same as the picture. What I received was white plastic without the O-ring or even a place to seat an O-ring. When trying to screw this into my 20# tank it was long enough that it tried to push in the safety valve, but ended up destroying the threads on the plug before it sealed.It looks more like:  136 PLASTIC SAFETY POL PLUG