The Ralston Instruments QTHA-FRS0 Stainless Steel 5/16 in.-24 UNF x Male Quick-Test Adapter connects a Quick-Test hose directly to a DP transmitter or gauge valve. The adapter uses the bleeder port when the transmitter is not mounted on a 3 valve manifold or gauge valve, or when the manifold is not easily accessible. This fitting makes a metal to metal seat on the transmitter or gauge valve, and a Quick-Test hose can be attached on the other side. The Quick-Test hose connects through the bleeder screw port on a DP transmitter. This unit also features a maximum pressure of 5000 PSI and a 9/16 in. wrench size.