Dual filler neck
His is out of a front runner sub tank kit for a land cruiser. It's not vehicle specific and if your looking to add a sub tank to your defender I'm sure you could make this work. I opted to go with. Toyota OEM filler neck for my truck but I know when I was looking at doing one for my defender this would have been money
$75 for the filler neck, $100 if you want the fuel hoses too (the hoses are worth a lot more than $25) plus shipping
Note the shorter 1.5" hose doesn't come with it, I used it on my set up.
It has a locking fuel cap with 2 keys. There are two fill necks, two vents, and one transfer pipe for a transfer pump to go from the sub tank to the main tank. If you wanted to put a second pick up in the sub tank this could just be capped off.
1967 Series IIa 109 5 Door - Work in progress
'98 Toyota Land Cruiser 100 Series