Here at Merlin we have a very large range and stock of fuel tank breather valves and roll over valves.
FIA Compliant Fuel Tank Vent Valve with AN6 Threads
Newton Fuel Tank Vent Valve with 90 Degree Tail
Newton Small Tank Breather Vent for Fuel Filler Caps
Newton Tank Breather Vent for Fuel Filler Caps
FIA Spec Fuel Tank Vent Valve with Male Threads
Roll Over Valve In Line With 1/4 (6mm) Push On Tails
Roll Over Valve In Line With 5/16 (8mm) Push On Tails
Roll Over Valve -6JIC Inlet X 1/4inch Outlet
Roll Over Valve -6JIC In Line
Roll Over Valve 1/4" x -6JIC
Roll Over Valve 5/16 Tail to -6JIC
Roll Over Valve -6JIC
Roll Over Valve High Flow with -8JIC
Newton Inline Breather/Vent Valve 5/16 (8mm) Push On