Regarding the solvent (usually purple) that is used for bonding PVC and
conduit plastic pipe together:
What's the best technique: coat just the male piece, or both pieces where
they join ?
The purple liquid is primer that is used for PVC pipe, but is not needed
for conduit. For conduit, it's best to use conduit cement, which is
thick and gray. Read the label for application. Generally, it will
require that the ends be clean and dry and that cement should be applied
to both ends. Immediately join them. The male end should seat
completely in the female end. Give a slight twist and hold for a couple
of minutes. Wear gloves to protect yourself; cement is flammable.
The BEST (strongest) PVC pipe joints ar made with:
primer on both, glue on both
using the clear light bodied glue
In 20 years of using this method I've never had a joint failure
the only two joint failures in all those years, were with the Red Hot
glue (that blue crap)
I switched on one installation (thought the blue crap was better
because all the pros use it)
Not better just faster (& more likely to fail)
tried that blue junk once on several joints in the irrigation system on
my parents farm, used on two inch main line. Luckily the section I used
it on was above ground at the time, over half of the joints failed
within a year or sooner. Like the pipe just blew out of the couplings.
Never had a failuer yet using the clear glue.
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