I have been doing a grooved pipe (Victaulic) demo in class for the past couple of years. 3" pipe with 90's, 45's, couplings, etc...I have each student install a section of pipe, then we test the monster with about 70# of water pressure to check for leaks. What's the best type or brand of lubricant to use on the rubber flex gaskets and what is the most economical grooving machine that Ridgid makes? So far I've been sending my pipe to a former student and he grooves them when he's on a job with the grooving machine.
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