Wet exhaust systems have decided advantages over dry exhaust systems. They are
quieter, cleaner and cooler; and do not pose a fire or burn hazard (eliminating
the need for insulation beyond the water injection point). Today, most pleasure
boats with inboard engines (for power, auxiliary, generator) have wet exhaust
Typically, raw water is pumped from the engine intake
seacock and strainer; through a heat exchanger, possibly oil
cooler(s) and water injection nipple or mixing elbow at the exhaust manifold;
and itâs dumped with the exhaust gas (cooled from 1100° F. + to less than 212°F.
on most engines) into the wet
exhaust piping and out the stern. Most commonly the latter is a combination of
flexible rubber exhaust hose, bellows & elbows; sometimes fiberglass or
stainless steel pipe (at least for connectors); and mufflers or silencers.
Flexible hose, bellows an elbows are easier and simpler to run than rigid pipe.
They are not subject to corrosion or stress cracking; and they absorb more
engine movement, vibration and noise. While the highest quality black rubber
exhaust withstands maximum continuous temperatures up to 250°F., some high
performance engines emit wet exhaust at 300° to 500° F. Here only silicone
rubber can be used.
Premium wet exhaust hose for longer bent connections. In
smaller I.D.'s for engine intake, critical water, drain, scupper bilge &
sanitation uses. Extra heavy tube and cover with helix between 2 ply
reinforcement provides excellent flexibility and bend radius. Resists heat,
ozone, exhaust, sani chemicals, panting and collapse. Exceeds New (SAE
J2006, ABYC and NMMA) Stds.** (see below). Black High
Temp EDPM Rubber 250°F (121°C). ISO 13363 Std. Pending.
5 YEAR WARRANTY
1/2" to 10"
13mm to 254mm
Black w/ Blue Stripe
I.D.: 1/2" (13mm) to 4" (102mm)
Coils: 50' (15m)
Lengths: 12.5' (3.8m) & 6.5' (1.9m)