It's a shower head on a flexible hose, and we use it all the time. There's something really satisfying about taking a hot shower while slow-cruising home after a day of swimming and hanging out on the hook. Love it.
Had the same one in our 342, not the best shower head in the world but we only took showers on the boat all summer every weekend for 4 years never considered a different one. By the way if the head breaks and you need to replace they stock at Home Depot. Pull out on the head to change it from faucet to spray.
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https://www.cpperformance.com/t-boat_wiring_colors.aspx
https://www.electricaltechnology.org/2020/07/marine-boat-cable-wire-color-codes.html
Its about 12” x12”
Dream 'Inn III -- 2008 400 Express
'05 Rinker 360 Fiesta Vee
Dream 'Inn III -- 2008 400 Express