| 摘要 |
A sewer fluid trap is disclosed, consisting of firstly a rigid flat plate permanently secured to a manhole wall surrounding a sewer pipe outlet. This flat plate has a pair of spaced-apart lateral slots. Secondly, an elbow having a lower end submerged in the catch-basin of a manhole and an upper end rigidly secured to a back-plate. The latter is removably inserted into the lateral slots, thereby forming a tight seal between itself and the back-plate. Central holes are formed in both plates and are in registry with the sewer pipe outlet when the trap is installed. A latch locks the two plates together. A ring is fixed to the elbow to lift the same and its back-plate from the manhole without having to descend into the same.
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