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The Fumoto DEF Valve is a drain valve designed to improve the ease of draining diesel exhaust fluid from a diesel-powered vehicle.

The drain valve is constructed of stainless steel, allowing it to last longer in the presence of DEF which can corrode other metal types. The valve’s internal Teflon seals and Viton O-ring are DEF safe as well.

Diesel exhaust fluid can be prone to freezing and opening a valve on a frozen DEF-tank can cause damage. The Fumoto DEF valve features a red indicator that becomes exposed when the valve is frozen, warning against operating the valve. This also provides room for the fluid to expand which can help prevent damage to the valve or tank.

The valve is currently made in the M14-1.5 size and will fit most DEF tanks, according to Fumoto. Other sizes will be made available soon.