Boss Part # HYD01620 Hydraulic Swivel Fitting 90 Degree Manifold 1/4 ORS x 1/4 FPS. On most Boss RT3 plows, on the hydraulic valve manifold, youll find (4) 90-degree fittings on the top of the assembly itself with (4) hydraulic hoses connected to them. This is the hydraulic swivel fitting if you ever needed to replace one of those (4) 90-degree fittings. Youll receive (1) fitting. This is OEM from Boss and used on most v-plows and straight blade plows.