old stock. doesn't look to have ever been fitted The item pictured is a Hauck Self-Cleaning Micro Oil Valve. It is used to provide accurate, graduated control of fuel oil flow to industrial burners. It is likely a 3/8-inch NPT connection model, such as the S-3-7D-UL or a similar variant. The valve features a linear flow control design, meaning each division on the dial corresponds to a proportional increase in flow. It is constructed with a solid brass body. The design is self-cleaning, intended for reliable operation in industrial environments.
