Replacement Dart Gasket Installation Instructions

walkin freezer dart gasket
Magnetic dart style gasket

There are various mounting styles of gaskets used in manufacturing walk-in coolers and freezers. Some are secured with screws, stapled onto a flat surface, or cemented into a channel. U.S. Cooler chooses to use magnetic dart style gaskets that push into a groove.
The causes of gasket failure are numerous, from loss of vinyl elasticity over many years to an employee ripping the gasket by running into it with a cart. If your gasket is building up ice or condensation, that’s a sign that your seal is not tight and you need a replacement gasket.

Installing replacement gaskets correctly is important to ensure a tight seal with no air infiltration or icing along the door frame.

Dart Style Gasket Installation Instructions

  1. door gasket drawing
    Soak the gasket in warm water for several minutes in increase pliability.

    Remove door from walk-in cooler/freezer (some hinges have lift-off capability when the door is open) and place on a pair of saw horses or table with gasket side up. Using a screw driver, remove the 7 screws from the inside edge of the old gasket if they were installed. (NOTE: some types of gaskets are not screwed in).

  2.  After old gasket has been removed place new door gasket around door, laying it out across the top and down the sides of the door. With door gasket in position around the door starting at the top corner, firmly seat the spur of the door gasket into the groove of the extrusion along the edge of the door using a hammer. It’s important that the spur be positioned over the groove correctly as it needs to be seated on the first impact of the hammer. Continue along the top of the door seating the gasket and then down the sides until you get to the bottom of the door.
  3. Trim the bottom of the door gasket so it just covers the metal strip of the door sweep. It should not extend onto the rubber part of the door sweep. If the gasket is trimmed, remove the rubber plug from the trimmed piece and insert it into the bottom of the gasket to keep the magnets in place. Use NSF approved silicone caulk to keep the rubber plug in place.
  4. Using a screw driver, install 7 screws into the locations shown on this drawing.
  5. Re-install door onto the hinge blocks on the walk-in frame and check door for proper operation.

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