5/8" barb fuel tank vent fitting?

[nitrobirdnester]

I'm putting in a secondary permanent fuel tank that was missing when I bought my boat. The vent hose in the boat is 5/8" ID. I'm looking for a fitting with 5/8" barb and 3/8" NPT thread. The problem is I can't find one with a long enough barb to use 2 clamps like ABYC recommends. Does anyone have a source for this?

 

[Scott Danforth]

Use narrower clamps

 

[JustJason]

I'm putting in a secondary permanent fuel tank that was missing when I bought my boat. The vent hose in the boat is 5/8" ID. I'm looking for a fitting with 5/8" barb and 3/8" NPT thread. The problem is I can't find one with a long enough barb to use 2 clamps like ABYC recommends. Does anyone have a source for this?

ABYC does not require 2 hose clamps on the vent hose. ABYC requires 2 hose clamps on fuel fill and engine exhaust systems only. 1 clamp is fine.