This is a single high limit snap disc that fits this Whitfield pellet Stove:
The manufacturer and parts lists indicate that this is only available in packs of three but this is a single item purchase offering.
manufacturer's part description - Disc, High Limit, Room Air Blower Jacket (L190-20F, Bakolite)
This is another older part #18120162 for this part
shop notes - 2fbr9-GR
This product was added to our catalog on Tuesday 30 November, 1999.