Toxic and flammable vapors are generated in the sewage system. Provide
ventilation from outside source, before removing treatment tank covers. Avoid
open flames and prolonged breathing of fumes.
g. The cover assembly consists of a plate joined by a common section of PVC vent piping. Remove the
cover carefully so as not to crack or damage the piping.
h. Remove capscrews, nuts and washers (2, FIGURE 2-6).
i. Remove cover assembly (4).
j. Remove and discard the cover gasket (1).
The PVC piping and joints must be water tight.
a. Check the PVC piping for signs of cracks or breaks. Replace the cover assembly if damaged.
b. Replace the end cover gasket (1, FIGURE 2-6). Refer to the removal and replacement steps in this
a. Clean the gasket sealing surfaces on the sediment tank and cover assembly.
b. Position the gasket (1, FIGURE 2-6) on the sediment tank.
Make sure the gasket stays in position while replacing the cover.