The best way to joint PVC and ABS plastic pipe
1 of 2
Photo 1: Connecting PVC and ABS
Slide the steel jacket onto the pipe. Then slide the rubber sleeve over one pipe and then the other. You may have to roll the sleeve back to get the pipe in. Tighten the jacket over the rubber.
2 of 2
Photo 2: Transition coupling close-up
A transition coupling consists of a rubber sleeve and steel jacket.
If you’re plumbing in a new drain or vent and have to join two different kinds of plastic pipe, black ABS and white PVC, don’t assume that you can simply glue them together. Most plumbing codes don’t allow
ABS pipe to be solvent-welded
(glued) to PVC. Check with your
local plumbing inspector. The proper
way is to use a transition coupling (Photo 2),
a neoprene rubber sleeve that
fits over each pipe. It’s then held
tight with a stainless steel metal
jacket and integral clamps. The coupling
will be labeled as to which type of
pipe (plastic ABS and PVC, steel,
cast iron, copper) each end can be
fastened to. Look for a plastic-to-plastic
designation on the coupling.
When inserting a pipe between
two fixed ends, cut the new piece to
leave an 1/8-in. gap at both joints.
Loosen and slide the metal jacket
and clamps off the rubber sleeves
and slide the jackets onto the fixed
pipes. Push one end of the rubber
sleeve onto the fixed pipe and then
roll back the other end (Photo 1)
to make room for the new piece of
pipe. Hold the new piece of pipe
between the two fixed pipe ends and
unroll the rubber sleeves over the
ends of the new pipe. Next, slide the
metal jackets over the rubber sleeves
and tighten the clamps. Snug them
up with a socket wrench.