Tiffin RV Basement Grommet
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Grommet to protect shore power cable and fresh water hose in power and water bays of Tiffin Class A RVs.
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- Creative Commons — Attribution — Noncommercial — Share Alike
This grommet protects your shore power cable and fresh water hose as they exit the power and water bays of Tiffin Class A RVs. Tiffin installs a grommet formed from a length of rubber gasket material. With use, this gasket can become loose and fall off.
This grommet fits over the U-channel that Tiffin welds into the floor of the power and wet bays. The inside width of the 2⅛ inch U channel is 1¾ inches or 45mm. The plug is optional, it is intended to discourage vermin from entering through the grommet when it isn't being used, e.g., when your coach is in storage.
I believe TPU is the better material for this part, but I don't have any on hand. With that, I printed this in PLA on a Prusa MK4S with 0.2mm layers (structural). I suggest you rotate the grommet 180° in the slicer, I used PrusaSlicer, so the grommet top is on the build plate. I found a brim produced the best result on Prusa's Satin Powder-coated Build Sheet. The plug can be printed as-is without a brim.
2025-07-09: I printed the grommet in Overture TPU at 0.2mm structural with the “Generic Flex” profile in PrusaSlicer. A brim is not needed; I printed on the textured plate (BP-24). I then revised the plug (not the grommet) as the original plug was a little loose in the TPU grommet, but it fits both TPU and PLA grommets. This plug has a top that fits over the entire grommet.