BRAND NEW! Never installed. This is an Airmar B3 transducer. These can be used on any 200khz instruments with the RCA-style plug as pictured, or cut the plug off and use on Raymarine ST30/40/60/etc. We have fairing blocks listed for these separately for $29.99 if needed. If there are any questions on compatibility, please send a message with the unit you are wanting to connect this to and we will advise.
Thanks for looking.