Based on several reviews I thought these seals would work with the Camco 39572 drain expander. Didn't fit. The overall diameter of the gaskets is much smaller than the gaskets in the Camco block. The fit is just perfect. Installed the Camco unit back onto the RV and pulled the black handle on the water tank valve. Water was leaking all over the extension. I removed the camco block the new gasket was much smaller it wasn't as thick (wide) as the old pad as tall (doesn't stick out of the groove) as the old t-seal I bought a new Camco unit Comparing the seal in the new block to these, it was obvious why it wasn't working would onate.
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