Pre-filter for garden pumps and domestic waterworks with a washable plastic filter insert to protect against sand and solids. Extends the service life of the pump. This 3-piece unit includes a screw ring for the filter glass, allowing for easy handling when replacing or cleaning the filter cartridge. It features a brass vent screw, a high-quality brass connection thread, and a transparent filter bowl for visual inspection. The housing is made of impact-resistant plastic.