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52
angle with the original drain a proper inspection chamber
shall be provided.
Sizes.
With the exception of drains from sinks and lavatories, no
earthenware pipe drain of less diameter than four inches
will be allowed.
Interceptor traps.
In cases where there are forecourts to the buildings or other
satisfactory means to enable an interceptor trap to be fixed,
so as to be readily accessible for the purpose of examination
and cleansing, such traps may be fixed, but no manholes or
interceptor traps will be permitted under the public footways.
B. W. Pipes, Sink Drains, Lavatory Drains, Bath Wastes, etc.
Eain water pipes, sink drains, lavatory drains, bath wastes,
&c., shall be constructed to discharge into the open air over
trapped or side inlet gullies. All bath and sink wastes
must be trapped immediately under the baths or sinks.
Gullies.
All gullies shall be of glazed stoneware with a water seal of
not less than two inches deep, and shall be fixed on and
bedded in concrete. Bell traps, masons' traps, lip traps, D
traps will not be permitted under any circumstances.
Manholes.
All manholes constructed shall be of sufficient size to admit
of ready access to the drain for the purposes of examination
or cleansing. They shall be built of sound stock or
other approved brick in Portland cement mortar and be
rendered internally with Portland cement. All manholes
shall be covered with air tight iron covers.
Ventilating Pipes.
There shall be constructed in connection with every manhole
in which an interceptor trap is fixed, a proper air inlet
with mica valve to prevent up-draught, and the drain in
connection therewith shall be ventilated at its highest