Pumpgard in-line strainers keep debris and particles from clogging your pump. They help the pump run cleaner, longer and cut down on repairs. Pumpgards use a clear plastic housing for easy inspection, quick disassembly and easy cleaning of the stainless steel screen. No mounting required, just cut the pump's intake line and insert the strainer. 20 mesh models (coarse) are recommended for use with bilge pumps, where larger debris may be present 40 mesh models (fine) are recommended for use with freshwater pressure pumps, where the water source is generally cleaner to begin with Dimensions: 4"L x 3"W x 3-1/2"H Replacement screens are interchangeable