A cast bronze air terminal cap machined to fit snugly on Schedule 40, 1-1/2 in. (3.8 cm) PVC tubing. Threaded to accept 1/2 - 13 threaded rod. Comes with rod coupling to attach air terminal, 1/2 EPDM washer and 1/2 flat washer. Approximately 4.5 oz. (128 g). Use suffix 3/8 or 1/2 to denote air terminal thread size.