This can be mounted on any flat surface (plastic, plexiglass tanks or concrete risers). It may also be used on corrugated pipe where the rim is flat. Mount with butyl and screw down. It can be used in place of a TAR when the opening is completely inside the inside diameter of the RTT adapter. You may mount a riser, riser safety pan or lid on top.
-Fits on the 'shelf' of corrugated pipe.
-Line the bottom of adapter with butyl sealant then screw on.