Brass, chrome plated; thd externally and internally; external thds 3/4 in. 16 unf size, 0.220 in. Thd lg one end, 0.750 in. Thd lg other end; 0.875 in. Hex wrenching feature between thds; internal thd 3/8 in. 24 unf size, 1.170 in. Thd lg one end, 0.260 in. Bore with o-ring groove other end