Vented bellows allow air and water to be forced out on compression when the brakes are applied. During a trailer inspection check the condition of the bellow for splits and tears and replace if damaged.
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MP2032B Bellows Without Bolt Cover, 35/55/3 Folds
Bellows for Knott KFG35 couplings with bolt 75/70/3 folds, widely used on Ifor Williams Trailers (P00873 / Knott 577005)
MP2034B Bellows for Bradley HU3, EH27 Cast Couplings (H09-H26, EH09-EH27)
MP2039B Universal Vented Bellows No Bolt, 60/60/5 Folds