RV-400 Stainless Steel Thru-Hull RealVision 3D 0degrees. The RV-400 brings RealVision 3D, CHIRP DownVision, SideVision and High Frequency CHIRP sonar into a low-profile stainless-steel housing. The RV-400 features rugged stainless steel through hull bodies suitable for fiberglass, wood or metal hulls. Each transducer comes with an isolation kit that creates separation between the stainless-steel transducer body and any dissimilar metal hulls, eliminating risk of galvanic corrosion. Ideal for inboard and outboard powerboats, the RealVision 3D Stainless Steel transducers are available as a single transducer for flat hulls or a split pair with Y-cable to accommodate deadrise angles up to 26degrees. The transducers also have a built-in attitude and heading reference system (AHRS) that stabilizes the sonar imagery, compensating automatically for vessel motion. You’ ll enjoy crystal-clear imagery even in waves, swells, and when maneuvering..