08-09-2023, 21:23
Fitting
• Smear the adhesive or glue on the underside of the Skin Fitting (Thru Hull) flange and a small way
up the thread, but no further than the thickness of the hull. It is important not to have any adhesive
on the exposed thread area as this could prevent the Nut or Ball Valve from turning.
• Insert the Skin Fitting (Thru Hull) through the hull from the outside. Note the TruDesign Skin Fitting
Installation Tool enables our skin fittings to be installed by one person saving time and money. See
separate information sheet on our web site.
• If necessary, place two strips of masking tape over the flange and attach to the hull to temporarily
hold in place. Go inside the hull to fit the Nut. Note it is good practice to have a backing plate to
spread the load especially if there is excessive curvature in the hull or the hull is very thin.
• Hold the thread down near the washer and screw on the nut. Once the nut is screwed down far
enough you can hold the fitting above the nut and then continue to screw the nut down onto the
washer ensuring it is only finger tight.
• On the outside of the hull clean off any excess adhesive. Tip – use an angled tool or putty knife to
‘blend’ adhesive around the Skin Fitting (Thru Hull) flange and the hull so it is easier to clean when
sanding and antifouling in the future.
• After recommended curing times, tighten the nut to no more than 15 ft lb. There is no need to over-
tighten the nut, especially if epoxy has been used, as the Skin Fitting (Thru Hull) is now an integral
part of the hull.
• Smear the adhesive or glue on the underside of the Skin Fitting (Thru Hull) flange and a small way
up the thread, but no further than the thickness of the hull. It is important not to have any adhesive
on the exposed thread area as this could prevent the Nut or Ball Valve from turning.
• Insert the Skin Fitting (Thru Hull) through the hull from the outside. Note the TruDesign Skin Fitting
Installation Tool enables our skin fittings to be installed by one person saving time and money. See
separate information sheet on our web site.
• If necessary, place two strips of masking tape over the flange and attach to the hull to temporarily
hold in place. Go inside the hull to fit the Nut. Note it is good practice to have a backing plate to
spread the load especially if there is excessive curvature in the hull or the hull is very thin.
• Hold the thread down near the washer and screw on the nut. Once the nut is screwed down far
enough you can hold the fitting above the nut and then continue to screw the nut down onto the
washer ensuring it is only finger tight.
• On the outside of the hull clean off any excess adhesive. Tip – use an angled tool or putty knife to
‘blend’ adhesive around the Skin Fitting (Thru Hull) flange and the hull so it is easier to clean when
sanding and antifouling in the future.
• After recommended curing times, tighten the nut to no more than 15 ft lb. There is no need to over-
tighten the nut, especially if epoxy has been used, as the Skin Fitting (Thru Hull) is now an integral
part of the hull.
