Whether you're working with PVC, ABS or cast iron, Mission couplings are essential for fitting a section of pipe into an existing run of waste line or vent. Installation is simple.
By the DIY experts of The Family Handyman Magazine:March 2007
Buy and assemble matching replacement
parts. Mark the cutting points
on the old drains about 1/2 in. larger
than the replacement.
Cut the plastic at a right angle
using a fine-tooth saw and remove
Slide the mission coupling onto one
pipe and cement plastic couplings
onto the other two pipes.
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
Have the necessary tools for this DIY project lined up before you start—you’ll save time and frustration.
Avoid last-minute shopping trips by having all your materials ready ahead of time. Here's a list.
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