1/2 3/4 Inch NPT/ BSPT Brass Material Sprinkler Head Upright/Pendent/Sidewall Fire Sprinkler - China Fire Sprinkler, Fire Sprinkler Heads | Made-in-China.com
Orbit 1/2-in MNPT x 3/4-in MNPT Cut-off Riser in the Flex Pipe Fittings & Risers department at Lowes.com