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P-501.7 House Traps
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An approved house trap shall be installed in each sanitary house drain and in each house storm
drain located within the property line of the building they serve, and shall be located at the curb line or in the building
just inside the foundation wall. There shall be an air inlet for fresh air entering the house drain just inside the water
seal of the trap.
Exception: Individual on-site subsurface sewage disposal system. (See Section P-1401.2)
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P-1401.2 Individual Subsurface Sewage Disposal Systems, House Trap
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For replacement of an existing building (house)
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Section P-502 Traps, Cleanouts, Interceptors, and Backwater Valves, House Traps and Fresh Air Inlets
The house trap shall not be less in size than the house drain pipe it traps, and in no case less than 5
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Philadelphia Plumbing Code > 5 Traps, Cleanouts, Interceptors, and Backwater Valves > P-502 House Traps and Fresh Air Inlets