X2 brand new and sealed not used as have changed my sink tap. Brand new water filter cartridge from UK Water Filters. This is the description from their website. Replacement Water Filter Cartridges Our top quality "Master Purifier" Universal cartridge can be fitted to many other makes of water filters, including: Brands like: Cuno... Ametek ... Liff ... Plymouth ... Bruner ... Noga... Pentek... Homebase... Screwfix... and many Other brands including reverse osmosis pre filters. This top quality filter will replace any cartridge types that are 9 and three quarter inches length x 3 inches or less diameter. With a 1 inch aperture at either end.
eBay