3/8" Male British Standard Pipe x 3/8" Female BSP ball valve. The most common configuration valve, this part is listed incorrectly in some La San Marco diagrams. See also V_531 and/or SM_527.
WARNING: This product can expose you to chemicals including lead, which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.p65warnings.ca.gov.