Vetus FTR330/25. Cooling Water Strainer. 330 series. All Vetus cooling water strainers have a transparent cover, allowing easy inspection of the filter without dismantling. Cleaning filter can be done quick and easily. The housing is made of polypropylene GF. These filters have 6 different hose connections. Filter element is made from Heavy duty Polyethylene and the cover is Styrol/Acryinitril SAN. ( hose 1 inch )