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Follow the precautions below for optimal
product performance and to reduce the risk of
property damage, personal injury, and/or death.
WARNING: A High-Performance Fairing must be
installed following the installation instructions that
accompany the fairing. A High-Performance Fairing
requires an anti-rotation bolt to keep the fairing from
turning while the boat is underway.
WARNING: Always wear safety goggles and a dust
mask when installing.
WARNING: Immediately check for leaks when the
boat is placed in the water. Do not leave the boat
unchecked for more than three hours. Even a small
leak may allow considerable water to accumulate.
CAUTION: CHIRP transducer—Always operate the
transducer in water. Operating in air will allow the
transducer to overheat resulting in failure.
CAUTION: Bronze transducer—Never mount in a
metal hull, because electrolytic corrosion will occur.
CAUTION: Stainless steel housing in a metal hull
requires using a Fairing Kit to isolate the stainless
steel transducer from the metal hull. Failure to do so
will cause electrolytic corrosion.
CAUTION: Never install a metal transducer on a
vessel with a positive ground system.
CAUTION: Never pull, carry, or hold the transducer by
the cable as this may sever internal connections.
CAUTION: Never strike the transducer.
CAUTION: Never use solvents. Cleaners, fuel, sealant,
paint and other products may contain solvents that can
damage plastic parts, especially the transducer’s face.
IMPORTANT: Read the instructions completely
before proceeding with the installation. These
instructions supersede any other instructions in your
instrument manual if they differ.
17-008-05 rev. 15 01/18/13
Thru-Hull, Depth with Stem
Transducer
Models: B45, B258, B260, B265LH, B265LM, B271W
SS258, SS260, SS270W, SS505
U.S. Patent No. 7,369,458. UK Patent No. 2 414 077. U.S. Patent Pending
Applications
• Bronze transducer recommended for fiberglass or wood hull only.
• Stainless steel transducer compatible with all hull materials.
Recommended for aluminum hulls to prevent electrolytic corrosion
provided the stainless steel transducer is isolated from the metal hull.
Identify Your Model
The model name is printed on the cable tag.
Tools & Materials
Safety goggles
Dust mask
Electric drill
Drill bits and hole saws:
Pilot hole 3mm or 1/8"
B45, SS505 22mm or 7/8"
B258, B271W, SS258 30mm or 1-3/16"
B260, B265LH/LM, SS260, SS270W 33mm or 1-5/16"
Sandpaper
Mild household detergent or weak solvent (such as alcohol)
File (installation in a metal hull)
Angle finder (installation with a fairing)
Band saw (installation with a fairing)
Rasp or power tool (installation with a fairing)
Marine sealant (suitable for below waterline)
Slip-joint pliers
Grommet(s) (some installations)
Cable ties
Water-based anti-fouling paint (mandatory in salt water)
Installation in a cored fiberglass hull: (see page 4)
Drill bits and hole saws for hull interior:
B45, SS505 35mm or 1-3/8"
B258, B271W, SS258 40mm, 41mm, or 1-5/8"
B260, B265LH/LM, SS260, SS270W 42mm or 1-5/8"
Cylinder, wax, tape, and casting epoxy
About Fairings
Most vessels have some deadrise angle at the mounting location. If
the transducer is mounted directly to the hull, the sound beam will
be tilted to the side at the same angle as the deadrise. A fairing is
strongly recommended if the deadrise angle exceeds 10°. Made of
a high-impact polymer with an integrated cutting guide, an Airmar
fairing is safer and easier to cut with a band saw and shape with
hand tools than custom fairings.
• Orients the sound beam straight down by mounting the
transducer parallel to the water surface.
• Mounts the transducer deeper in the water for clean flow over
the transducer’s face.
• Airmar High-Performance Fairing has a long streamlined
shape, directing water around the transducer to minimize drag.
Performance is excellent above 15kn (18MPH). (To order see
“Replacement Parts” on page 4.)
Record the information found on the cable tag for future reference.
Part No.________________Date___________Frequency_________kHz
B45
Standard
High-Performance
Fairing
Fairing
INSTALLATION INSTRUCTIONSOWNER ’S GUIDE &