Standard cartridge filter and retainer. Fits 5 to 25 gallon Channellock units. No. VCFS.CL: Size: 5 - 25 gal, Type: Standard, Filter Efficiency: Standard, For Use With: Channellock, Pkg Qty: 1, Package Type: Box Thanks for shopping Hipp Hardware Plus's Online Store for all your DIY and Home Improvement needs. Remember Hipps Help!