We need a gasket for a Master-bilt walk in cooler. We don’t have the model # just the serial # which is D3946

[fixbear]

Julia,  Walk in coolers are assembled from many venders parts.  Most manufacturers will use a condensing unit, evaporator and door from a outside supplier. Then make the Floor, walls, and top. It then can be assembled on site.  If you look inside on the door frame you will find a manufacturer and model of the door.  It may even be a master built door.  But without that you will have to go to a house that makes custom gaskets for refrigeration.  They will need the door outside dimensions,  The gasket type and mounting,  and the gasket outside dimensions. Obviously having the door model number is the easiest way to go.. If you can’t find the model, you would have to call master-built and hope they may have a record of it.  Be aware, that they may have bought it and just relabeled it as there’s.  Year may help.