To prepare the macerating pump unit, start by pushing the flapper check assembly into the opening (figure A). Make sure that the flapper assembly faces in the same direction as the elbow.
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Figure B
Figure C
Figure D
Figure E
Push the elbow onto the connection and secure it with a clamp.
To tap into the vent, use a reciprocating saw to cut through the pipe. Put down a drop cloth or use a bucket to collect anything that comes out.
Remove about a 12 inch section of pipe (figure B).
Clean both ends of the old pipe, then put rubber adaptors onto the old pipe.
Prep up a one inch and 1/2 inch 'Y' with short pieces of PVC so that they'll span the gap in the pipe, then connect the rubber adaptors.
Put the 'Y' into place and slide the adaptors over both ends (figure C), then firmly tighten down all clamps to avoid leaks.
Next, remove the cleanout cover on the sewer line (figure D).
Note: make sure that no one is using the sink while you're doing this or sewage could come out the open pipe.
Once the cap is off, set up a threaded male adaptor with a 3/4 inch reducer. Coat the threads on the male adaptor with Teflon paste (figure E) and screw it into the cleanout. Use a plumber's wrench to make sure the adaptor is snug.
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