Valves turn different functions on and off from a cockpit-mounted valve panel. Harken’s valves are very low-profile and weigh half as much as comparable valves. Each single- or double-acting valve has its own pressure relief to adjust hydraulic power to the maximum working loads of individual mast and sail controls. Standard 5000 psi versions and sculpted 10000 psi Grand Prix versions are machined from hardcoat-anodized 6061-T6 aluminum. Inline and manifold-mount relief valves control the maximum pressure of the entire system. Inline reliefs work with any manual system. Manifold-mount reliefs fit any Harken manifold. Remote dump valves allow sail controls to be eased from the helm, rail, and other key positions. Either use it as a quick-release or regulate its speed with an optional adjustable flow control. Valves are offered with short and long shafts. The short shaft fits 3 mm deck/panel thickness. The long shaft fits 4 mm to 25 mm deck/floor thickness.