4-in-1 Filter Replacements › 4-in-1 Multifuncation Filter Replacement Image 1 of 1 4-in-1 Multifuncation Filter Replacement £59.95 Compatible with a range of 4-in-1 boiling water tap systems, that work with a single filter unit. Frequency: One time purchase £59.95 Subscribe Save 10% Sale Price: £53.96 Original Price: £59.95 Every 6 months Add To Cart Added! Compatible with a range of 4-in-1 boiling water tap systems, that work with a single filter unit.