The Rankin Delux RDHP-08 Top Burner Valve 1/8" NPT Inlet and a 3/8" outlet to connect with a controlled flow line. It is fixed in line to control flow of gas or fluid to a top burner outlet. The valve has a manual adjustment point where the flow can be opened, limited or closed as necessary. It is part of the control path of the system and ensures continuous delivery and aids in the c... https://partsfe.com/valve-top-burner-for-rankin-deluxe-part-rdhp-08