One unit as shown Brass with patina and some paint. Untested surplus looks used,sold as is as you see it. looks to be standard 1/2 " metal pipe thread on bottom 0.7" inner diameter, looks to be standard faucet/hose type threads on side 1.08" outer diameter of threads,. Round body is 2.4" diameter This Dunham 1C Brass Steam Trap is a high-quality product designed for efficient and reliable operation. It features a thermostatic disc valve that ensures optimal temperature control in your radiator system. The brand Dunham is known for its exceptional quality, and this model is no exception.