| http://www.w3.org/ns/prov#value | - An intrusion ring 6 made of metal or hard synthetic resinand a leakproof packing 8 made of such as rubber are inserted in the grooves 7 and 9, respectively, and a pipe 1 made of synthetic resin such as polyethylene is loosely, thru pipe 2 and rings 6 and 8 as shown.
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