Uniseal tank fittings seal around a pipe where it passes through the tank wall. The flexible rubber fitting grips the pipe’s outside surface, providing a direct connection without a threaded tank fitting.
Seal sizes correspond to the pipe’s actual outside diameter. Pressure, DWV and stormwater pipes can have different outside diameters even when their nominal sizes are the same.
Fitting notes
Cut the tank hole to the specified diameter and remove ridges and burrs so the seal seats evenly. Bevel the pipe end by at least 15° and smooth any sharp edges to avoid cutting the seal.
Wet the pipe end and apply liquid detergent to its outside, then push it through from the Uniseal’s wide flange side. The detergent is squeezed away as the pipe passes through, leaving the seal gripping the pipe. Do not use silicone, grease or Vaseline, which can compromise its grip under pressure.
Uniseal Pipe and Hole Sizes
Uniseal Installation Guide
Uniseal Fitting Dimensions
