This is a single high limit snap disc that fits this Whitfield pellet Stove: Cascade (WP5)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 partshop notes - 2fbr9-GR