U-Flow Seals and Screwdriver

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A patented mechanical compression seal used to shorten the PC/PET RetroDrain. Tough nylon flanges and stainless steel screws provide the necessary strength torque to compress the EPDM rubber gasket. The seal is activated by tightening the internal screws with the U-Flow screwdriver. This compresses the thermoplastic seal, forcing it to expand and make contact with the wall of the old pipe, thus preventing vertical movement and stopping water backup damage. This design feature is incorporated in all U-Flow retrofit drain products. Available in 3-in., 4-in., 5-in., and 6-in. sizes.



The U-Flow Screwdriver is an accessory product used in the installation of U-Flow products. The extra long screwdriver is fitted with a square socket tip (#2 Robertson) for tightening the special recess head screws on the U-Flow compression seals. The 12 1⁄2-in. shaft of the screwdriver ensures ease of reach when tightening the U-Flow Seal connection screws on all U-Flow retrofit products. The U-Flow screwdriver comes complete with a loss prevention bar.

Physical Data
Ordering Info
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OlyFlow RetroDrains are designed to replace existing drains in re-roofing applications. Installed from the roof surface, the OlyFlow RetroDrains are engineered to be installed without removing the existing plumbing or fixture while providing a watertight connection to the roof system and the existing plumbing.

Physical Data

Drain SizeO.D. of Pre-Expanded Seal (in.)Fit Into Pipe I.D. (in.)Fully Expanded (in.)
3-in. 2.86 2.88 3.40
4-in. 3.74 3.76 4.40
5-in. 4.73 4.75 5.40
6-in. 5.75 5.77 6.40


Due to manufacturing variances and jobsite inconsistencies, these figures are to be used as a guideline and are not a guaranteed fit in “tight” situations.

Ordering Information

SKUSize (in.)PackagingWeight (lbs.)
UF3 3 Each 1
UF4 4 Each 1
UF5 5 Each 1
UF6 6 Each 1

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