| 摘要 |
An integrally formed riser pan member for use as a modular component within an access passageway for an on-site waste disposal system, such as a septic tank, to receivably retain a secondary cover member within, the riser pan member including a cylindrical body having an upper portion having a vertical wall member adapted to receive another modular passageway component thereon, and a lower portion which includes an integral pan portion to seatably receive a secondary cover member. The riser pan member further includes an annular ring between the upper and lower portions. The riser pan member can be employed as a lowermost, a highermost, or as an intermediate component in, for example, an access passageway formed of multiple stackable riser members. In addition, the riser pan member may be formed integrally with a stackable riser member.
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