Installing a Mission coupling
1 of 4
Photo 1: Mark cuts
Buy and assemble matching replacement
parts. Mark the cutting points
on the old drains about 1/2 in. larger
than the replacement.
2 of 4
Photo 2: Remove pipe
Cut the plastic at a right angle
using a fine-tooth saw and remove
3 of 4
Photo 3: Install new pipe
Slide the mission coupling onto one
pipe and cement plastic couplings
onto the other two pipes.
4 of 4
Photo 4: Finish up
Center the mission coupling over
the third joint and tighten the
When repairing a section of pipe in an existing run, don't try to cement (solvent-weld)
all the new couplings. Most
drain systems use rigid pipes fairly large in
diameter. You can't flex them enough to
slide on that last fitting and get it to seat
fully. Rather than struggle with cement,
pros use a “mission” coupling (Photos 3
and 4) that clamps over the last joint.
Even though a mission coupling costs more than a plastic
coupling, the extra cost is worth it.
Sometimes, pros will even use two mission
couplings in tight situations.
Photos 1 – 4 walk you through the
process. Be sure to buy couplings with
full steel sleeves, and make sure mission
couplings meet code requirements in