This topic has 0 replies, 1 voice, and was last updated 2 months, 2 weeks ago by Paul Bruk. Author Posts September 20, 2023 at 8:29 pm #2707 Paul BrukParticipant Just replaced my fuel valves. I have a B model and my inboard tanks were 1/4 NPT. If your valves take a 9/16 wrench, it is the Curtis 1300 or 1600. Author Posts Viewing 1 post (of 1 total) You must be logged in to reply to this topic.