Do Fumoto valves include gasket washers? Andrew June 18, 2018 15:49 Follow Yes. Every Fumoto valve includes a washer unless they are NPT threaded, in which case they do not need gasket washers. Related articles Can I install a Fumoto valve if my oil pan threads are stripped? Are Fumoto valves magnetic? Do Fumoto valves include the lever safety clip? What's the difference between all of these valves? Do I need a lever clip to use a Fumoto valve? Comments 0 comments Please sign in to leave a comment.