Universal Fuel Water Separators | Air Filters, Oil Filters Ryco Fuel Water Separator Filters. Fuel water separator filters provide additional 'pre-fuel-filter' protection for standard fuel filters in diesel delivery systems, removing water and contaminants from the fuel. Purpose: Additional protection for diesel fuel delivery systems. Suitable for Diesel and Bio Diesel blends up to B20. Universal Fuel Filters - Ryco Filters | Automotive Filters Note: the internal diameter of inlet and outlet fittings (eg, brass fittings) can alter flow rates, however maximum flow rate is determined for the R2132P element. R2132P – 18 nominal micron; Fuel line pressure not to exceed 206kPA/30psi; Water resitant silicone coated filter media provides maximum efficienty, lie and flow for all fuels.