Importance

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Abstract

In a primary sanitary sewer line having at least one lateral secondary sewer line connected therewith and having the bore of the primary line sealed by an impervious plastic liner tube, a sleeve is inserted into the end portion of the lateral line at its connection with the primary line prior to the installation of the liner tube and abuts and is sealed with the wall of the liner tube in a manner permitting visual indentification, from within the liner tube, of the exact position of the lateral line connection with the primary line whereby, using the inner wall surface of the sleeve, that portion of the plastic liner tube wall covering the adjacent end of the sleeve may be reamed out of the sleeve without damage to the primary or secondary sewer lines.

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First Claim