All VETUS cooling water strainers are provided with a transparent cover allowing easy inspection of the filter without dismantling. Cleaning of the filter can be achieved quickly and easily. Due to the large active surface however the filter seldomneeds to be cleaned. Features. 19 mm Type 330 HO Cooling Water Strainer. Made with high quality materialSpecifications. Filter Element HD Polyethylene. Housing Polypropylene GF. Size 19 mm. Country of Origin Netherlands