VETUS O-Ring & Cover f/Waterfilter 330 Set. Set O-Ring & Cover for Waterfilter 330 Specifications for VETUS Set O-Ring & Cover f/Waterfilter 330: Manufacturer: VETUS Color: Black Features of VETUS Set O-Ring & Cover f/Waterfilter 330 Vetus part #FTR3301 is replacement strainer cover and o-ring for all Vetus FTR330 series raw water strainers Strainer size: 13 (33/64") to 38 mm (1-1/2") Note: Do not overtighten Package Contents: VETUS Set O-Ring & Cover f/Waterfilter 330 VETUS FTR3301: O-Ring & Cover f/Waterfilter 330 Set