This transducer mount designed specifically to be used in a Marine Environment.The installation of transducer mounting plate is quick and easy,Help you get more accurate data and enjoy fishing activities more comfortably.Compatible with Models XNT 9 20, XNT 9 20 T, XNT 9 QB 90 T, XNT 9 QB 90, XNT 9 SI 180 T; It also work with fish sensor.XHS 9 HDSI 180 T,HELIX 12 CHIRP SI GPS,HELIX 10 SI GPS,HELIX 9 SI GPS,1199ci SI GPS,999ci SI GPS,1198c SI GPS,998c SI GPS.