GMC 1976 ZEO 6083 Maintenance Manual page 832

24L- 6 HOLDING TANK AND DRAINAGE SYSTEM
REMOVAL
1 . Drill off heads of rivets.
2 . Remove vent cap and gasket .
DRAIN PIPES AND FITTINGS
All drain pipes and fittings are made from ABS
plastic . Repair using a hacksaw to cut out damaged
portion of pipe . Connect a new pipe section with
unions . Fittings (elbows, unions, "T's", etc.) may be
more difficult to replace and some rerouting may be
necessary. Follow
the adhesive manufacturers
recommendation for preparing the pipe and fittings
for assembly .
"P" traps are easily removed for cleaning if they
become clogged. To remove a "P" trap loosen com-
pression fitting on either end of the trap as shown in
Figure 7. Clean trap, position in vehicle and tighten
compression fitting by hand .
VENT LINE ROOF CAPS
There are three vent lines . Each vent line has a
roof mounted cap to help prevent anything from
entering the system from the roof which may plug
the vent line .
INSTALLATION
Figure 7='P" Trap (Typical)
1 . Replace gasket and vent cap. Check for proper
fit, add sealer to gasket (both sides) if required .
2. Pop-rivet vent cap to roof.