Multi-purpose lid for septic tank and an associated riser
A kit, and an assembly formed with components of the kit, comprises a fitting for the top of a septic tank or water tank, one or more frusto-conical rings shaped to interconnect with an identical ring to form an undulating wall riser that extends upwardly from the tank top fitting, and a lid. The lid is shaped for multi-purpose use: closing off the opening of either the large end or the small end of a ring/riser—whichever is uppermost, or closing off the fitting when there is no riser. Joints between the rings of the riser, and between a ring/riser and the fitting of a tank, are held together by latching tabs and/or screws. A fitting may be integral with a tank top.
1. An assembly, useful as part of a wastewater treatment system, comprising:
a fitting having
a flange which is attachable to, or capable of being integral with, the top wall of a septic tank, a rim defining the periphery of an opening in the fitting,
a web, having a top surface, running radially inward from the flange to the rim,
a circumscribing first ridge on the web top surface in proximity to the rim, and
a circumscribing second ridge on the web top surface, the second ridge larger in circumscribing dimension than the first ridge; and
a lid, positioned on top of the fitting, the lid having
a top,
a circumscribing inner skirt extending downwardly from the top,
a circumscribing outer skirt extending downwardly from the top, the outer skirt larger in circumscribing dimension than the inner skirt,
a pair of spaced apart circumscribing fins, each fin extending downwardly from the top, the fins defining a circumscribing channel therebetween,
a circumscribing gasket located in said channel;
wherein, said inner skirt of the top is positioned within said fitting opening in close proximity or in contact with said fitting rim; and,
wherein said gasket of the top is in contact with said first ridge on said top surface of the fitting.
2. The assembly of claim 1 wherein at least one ridge of the fitting comprises gasket material.
3. The assembly of claim 1 further comprising a septic tank or a water tank having a top wall, wherein the flange of the fitting is attached to or integral with said top wall.
4. The assembly of claim 1 wherein the flange comprises a step where the flange meets the web.
5. The assembly of claim 1 wherein the fitting further comprises a first skirt and a spaced apart second skirt, each skirt descending downwardly from the web.
6. The assembly of claim 1 wherein the fitting and the lid are made of thermoplastic.