Review on Manchester Tank S33250: Durable Plastic POL Plug for Propane Gas Tanks by Edward Henderson

I was looking forward to an extra level of security when transporting my 20# tanks. Saw these and bought two. Unfortunately, the threads don't seem to line up with the threads in the tank, and even after very careful aiming, it doesn't go straight. I'm still looking for a replacement option but this seems like the best option available on Revain. I would like to give a 5 star rating as otherwise they seem very well designed - just don't work properly.