Locking fuel cap for National diesels

[mbrandt1402]

My TropiCal uses a fuel neck and cap produced by SeaDog. Given the amount of shared components across the National product line, I assume most of their diesel RVs used the same parts. SeaDog produces a locking cap that is a direct replacement for the threaded disk cap. It appears to be available only as a set (filler neck and locking cap) shown here. The TropiCal uses the 351331L.

Note that SeaDog is wholesale only. I have a business relationship with a SeaDog subsidiary and got my parts through them, so I can't comment on retail availability. That said, I am VERY happy to be able to better secure ~ 100 gallons of diesel.

[Tradewind98]

I have a 98 Tradewinds and it shares a locking gas cap with a 1998 Toyota Tacoma. A locking cap is the way to go.