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DEPTH TH52
INSTALLATION INSTRUCTIONS
Thru-Hull Depth Transducer
Low Profile, Flush, and Retractable Models
IMPORTANT: Please read these instructions completely before proceeding
with the installation. These directions supersede any other instructions in
your instrument manual if they differ.
WARNING: NEVER USE SOLVENTS!
Certain cleaners, fuel, paints, sealants, and other products may contain strong solvents,
such as acetone, which attack many plastics greatly reducing their strength.
1 Applications
• Plastic housing is recommended for fiberglass or metal hulls only. Never install a
plastic thru-hull sensor in a wood hull, since swelling of the wood may overstress
the plastic causing a fracture.
• Bronze housing is recommended for fiberglass or wood hulls only. Never install a
bronze housing in a metal hull, because electrolytic corrosion will occur.
• Stainless steel housing is recommended for metal hulls to prevent electrolytic
corrosion.
• Never install a metal housing in a vessel with a positive ground system.
2 Tools and Materials Needed
Safety goggles
Dust mask
Electric drill with 10mm (3/8") or larger chuck capacity
Drill bit: 3mm or 1/8"
Hole saw (see table on page 1)
Beveled countersink tool for B21, P269, and P314
Countersink tool for B119, P217, and P219
Sandpaper
Mild household detergent or weak solvent (alcohol)
File (installation in a metal hull)
Marine sealant
Additional washer for some aluminum installations
Slip-joint pliers for metal housing
Silicone grease or petroleum jelly (Vaseline
® ) (retractable units)
Zip-ties
Water-based antifouling paint (mandatory in salt water)
Installation in a cored fiberglass hull:
Hole saw for hull interior: (see table on page 1)
Fiberglass cloth and resin (see page 4, #5)
or Cylinder, wax, tape, and casting epoxy (see page 4, #5)
4