Seastar Solutions HF6010 Orb Kit-Add Helm/Autopilot Inboard, Hydraulic Steering Designed for: Steering CylinderThese fittings fit updated Seastar cylinders and all helm pump to use O-Ring (ORB) type fittings. Before the update all Seastar Solutions helms used NPT fittings. These 316 stainless steel fittings will simplify the installation process and will allow for simple orientation of fittings after installation. ORB type helms are clearly marked with "DO NOT USE NPT Fitting".