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One can purchase a thread gage from the following stores: Amazon, The Gage Store, Ring Plug Thread Gages, Grainger, Deltronic, Ideal Gage, eBay, Vermont Gage, Gage Maker, GS Gage, to name a few.
HDPE pipe can use a rubber ring, if the rubber ring is properly sealed with a steel gasket. The rubber ring must be placed in a groove in the pipe and then the steel gasket is placed on top of it.
Mr. Kaulitz's looks to be about a 14g
A Tennikoit ring has a circular shape and it is made of rubber.
A rubber ring
If a new rubber ring is used and the surfaces are clean and free of nicks there is no need for additional sealer.
LUTE (a packing ring of rubber for fruit jars)
Ring Clark rubber and ask
it is called a penius
Artificial Rubber
A ring, ruler, rubber, rubber duck, etc.
Not all that heavy, really. It's a ring of rubber, but it's hollow on the inside.