Raymarine Nylon Depth Thru-hull For: ST30 ST60 Instruments
"P19 Plastic Low Profile through-hull transducer. 200 kHz. For ST70/ST60+/ST290 Instruments. 45 Feet of cable. Compatible with the following instruments: ST70* ST60+ ST290 Compatible hull material: aluminum, and fiberglass Cable: 45 ft cable Hole diameter for installation: 2" *Using with ST70 requires purchase of ST70 Depth Pod, sold separately"