Black Rubber Exhaust Bellows - 3-1/2" ID

Hump Hose Bellows provide 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.

These THH Series molded hump exhaust bellows are 100% EPDM* rubber (with no textile reinforcement). Available in 3" to 10" ID sizes.

• Black bellows: made from molded, high temperature, black EPDM rubber. Rated -40°F to +250°F (121°C) continuous duty maximum, with a 5-year warranty
• Inlet/outlet cuffs are long enough to fit 2 hose clamps
• Also available in "step-up" versions
• Also available with (4) T-Bolt stainless steel hose clamps included. See Related Products.


High Temperature Hump/Bellows Exhaust Hoses Color Comparison
• Black bellows: 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 with or without multi-ply fiber reinforcing (red interior). Rated -65°F to +350°F maximum continuous, with a 10-year warranty
• Red bellows: made from an extra high temperature, red silicone rubber. Rated -65°F to +500°F maximum, continuous with a 10-year warranty

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