P79 In-Hull Transducer w/Humminbird #9 Plug - 7-PinOur P79 in-hull transducer easily adjusts to hull dead rise angles up to 22deg. This ensures that the beam is vertically oriented to receive echoes, resulting in accurate depth readings. Unlike traditional "puck" type transducers, our P79 consists of a base that is bonded to the hull and filled with liquid. The separate transducer then attaches to the base with a twist lock. The sound waves travel more efficiently though the liquid, giving the best possible performance.Features: Adjusts to hull deadrise angles from 2Adeg to 22Adeg No holes to drill Depth only Recommended for solid fiberglass hulls Adheres to aluminum hulls under 3.8 mm (0.16") thick Recommended for planing-hull power boats, trailered boats, rigid inflatable boats (RIBS), and racing sailboats No hull protrusions Boat Size: Up to 8M (25&';) Specifications: Weight: 2.3kg (5lb) Hull Deadrise: 0Adeg to 22Adeg Acoustic Window: Layered plastic urethane This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns. Specifications: Mounting Style: In-Hull Box Dimensions: 4"H x 8"W x 10"L WT: 1.8 lbs Owner&';s Manual (pdf)Brochure (pdf)