On August 1, 2018 at 13:38, BizarroTerl said...
...any little globs of hardened glue become a major trap.
Only applying glue on the male portion of the connections prevents glue problems on the inside of the raceway or in this case the cvac pipe. Glueing the female portion causes the glue applied to be scraped forward into the fitting and hardening into a ridge that can collect debris and eventually form a clog.