Airlock for cleaning grease trap dwg

This is an improvement to the method of emptying and cleaning a grease trap within a storage enclosure to prevent contamination of ground and reduce odors from it; the lock is made such that allows the installation of the same on the lid; It includes rubber stamps; the frame of the lock is crafted in foil to - 136 5mm thickness and a manhole cover in PVC 110 MM

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