Hollister - Replacement Filters are convenient to use with Hollister drainable pouches that have replacement filter holders. This filter is a replacement for the filters that come with the Hollister pouches, it is not an adhesive backed filter and it fits inside the pre-attached plastic filter holder. The superior design allows filter discs to be used for up to 48 hours and 2 filter discs are supplied if you choose to use the CenterPointLock ostomy bags without a filter. This product works specifically with the Hollister CenterPointLock Drainable pouches, Series 383x, 385x, 389x.