Hauck S-3-7D-UL 3/8" Self-Cleaning Micro Oil Valve is engineered to produce accurate, reproducible linear flow control of oil to any type of industrial process. Solid brass body construction 3/8" NPT connections UL approved Note: This valve is intended for flow control. It is not designed to replace a shutoff. For tight shutoff, a ball or solenoid valve should be provided in the fuel supply line. Replaces S37, S37D, S37C, S-3-7C, Power Flame 262260, Hauck# HK42573, 42573