LFM - Tee-Based Manholes - Brochure

Tee-Base Manholes are constructed as a two-piece manhole consisting of a fiberglass tee-base and manhole riser. The FRP tee-base is constructed of the same material as the adjacent FRP mainline pipe and is installed as an in-line tee. The branch outlet of the tee is positioned upward to provide access from the riser to the pipe. The riser is then lowered onto the tee to create a complete manhole. Typically, a pipe coupling is pre-fabricated into the bottom of the riser to provide for a watertight seal against the tee-base. The pipe coupling is provided by the manufacturer of the FRP sewer pipe.