These cartridges can be used to replace the Water filter cartridges on any system using 1/4″ pipe. The cartridges have built in push fittings, which mean you can simply push your 1/4″ water pipe straight into the cartridge to make the connection (no stem fittings are needed). Full instructions included, change a filter in seconds. The Water Filter Man Ltd in-line filter has been tried and tested in the market for years amongst thousands of satisfied customers. Save huge amounts of money compared to purchasing original filters, without compromising on quality. Filters use moulded built in 1/4″ push fittings which are constructed by NSF certified materials. This means these filters are amongst the easiest to change and the most reliable and least likely to leak – compared to screw in push fittings where the thread can often leak, the Water Filter Man Ltd fridge filters do not have this problem.