Interstate Pneumatics PW7160 1/4" Stainless Steel Inline Water Filter. Add longer life and durability to your pressure washer valves and seals. This Stainless Steel Filter will make sure your pressure washer operates for a long time. Features cleanable metal screens that never needs to be replaced. One end is 1/4" plug (stainless steel), the other end is 1/4" MNPT (brass)