Abstract: An improved relief valve is disclosed for use with a pressurized system. The improved relief valve includes an integral drain line coupling that prevents the outlet of the relief valve from being plugged or restricted in any manner such that discharge from the pressurized system flows uninhibited to an appropriate drainage point. The coupling includes a nipple which is rigidly secured to the outlet of the relief valve and which is coupled by a nut member to a drain line. In addition, the nipple is adapted for receiving a wrench for countervailing a torque transferred to the nut member.