Review on Optimized Marinco 30 Amp & 50 Amp Sealing Rings by Quinton Wonsley

Once installed it won't screw into my jack without too much force (using pliers). It's so tight I can't turn it by hand. The thread fits perfectly and is the right model/size for my camper and lanyard, but it's so tight on the elastic that it barely turns even with pliers. Using a small amount of olive oil helped, but not much. This was NOT an easy install. Even with a hair dryer and then a heat gun it took a long time and I was afraid it would break. I finally got it on my RV's power cord after a lot of tinkering with a screwdriver, lots of heat, and olive oil. It took me over 30 minutes to put it on!