American Valve G60S 1/2" Lead Free Brass Sweat Stop and Waste In-Line Valve
you are buying 2 pieces. 

The American Valve G60S is a lead-free, stop & waste valve with female soldered ends. It features a drain cap, which allows water to drain or vent while the valve is closed. Complies with lead-free Plumbing laws. Cap allows draining of downstream side when closed. solder ends.