Raymarine Realvision RV-220P Installation Instructions Manual page 13

23. Remove the Cable protector by pulling the 2 tabs away from the back of the Hull nut.
24. Apply a thick bead of marine grade sealant to the bottom face of the Hull nut.
25.Screw the hull nut onto the threaded stem-tube and tighten by hand.
26.Fully tighten the hull nut using a suitable sized wrench (spanner).
In order to prevent leaks and transducer movement, ensure that the nut is adequately tightened.
You should see the sealant protruding from the edges of all applied surfaces.
Important: Do NOT overtighten. Overtightening can cause damage to the hull which may result in
water leaking into the vessel.
27. From inside the vessel, slide the small bronze washer over the anti-rotation bolt.
28. Screw the anti-rotation bolt nut onto the bolt and tighten by hand.
29. Fully tighten the anti-rotation bolt nut using a suitable sized wrench (spanner).
13