Simrad ss175m stainless steel chirp thru hull with 12 degree tilted element model: 000-13778-001 80-130 khz medium chirp frequencies suitable for fiberglass and wood hulls 1 internal broadband ceramic thru-hull with stainless steel housing the ss175m is a stainless steel thru-hull chirp transducer ideal for sportfishing and commercial vessels up to 8 m 25 ft in size.
