Silicone Double Hump Hose Bellows provide extra-flexible connectors for marine wet exhaust systems. They offer much greater tolerance to heat, misalignment, engine movement and vibration than rigid connectors, with significant savings in cost, parts, labor and space.

Characteristics of the 274V Series of Double Bellows Exhaust Hose:
Glossy blue, very high temperature, 100% silicone* rubber, which is reinforced with multiple plies of polyester fabric.
Double humps - provide additional flexibility for severe vibration or engine misalignment
Designed for wet exhaust & higher pressure critical water service.
Available from 2" to 16" inside diameter.

100% blue silicone rubber bellows - rated -65°F to +350°F maximum, continuous duty, with a 10-year warranty
Hand built
Inlet/outlet cuffs are long enough to fit 2 hose clamps
Note: Any part #s ending in SS come with 4 wide stainless T-bolt hose clamps

High Temperature Exhaust Hose Color Comparison
Black exhaust hoses: made from molded, high temperature, black EPDM rubber. Rated -40°F to +250°F maximum continuous, with a 5-year warranty
Blue exhaust hoses: made from a very high temperature, blue silicone rubber. Rated -65°F to +350°F maximum continuous, with a 10-year warranty
Red exhaust hoses: made from an extra high temperature, red silicone rubber. Rated -65°F to +500°F maximum continuous, with a 10-year warranty

The addition of multi-ply fabric reinforcing enhances a hose's pressure resistance for coolant, turbocharger, and other higher pressure applications.

*Silicone rubber's outstanding characteristic is its resistance to higher temperatures, as well as having a longer service life than EPDM. Silicone hose is compatible with water and anti-freeze/coolants.
By comparison, EPDM (Ethylene Propylene Diene Monomer, commonly referred to as EPDM or EPDM rubber) can withstand modestly high temperatures and exhibits excellent resistance to environmental factors such as Ozone, UV, acids, bases, and general weathering.
Neither of these synthetic rubbers is compatible with fuel or oil, so be careful to protect from exposure.

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