Features Onboard air system powers Wolo Express or any high-pressure horns Can sound the Wolo Cannon Ball Express horn for ten seconds straight This onboard air system powers Wolo Express Horns, like the Cannon Ball Express, or any... The Wolo 837 is the perfect choice when a truck owner demands an ultra-powerful horn. Gives any 12-volt truck a true train horn sound. The Cannon Ball Express requires an on-board air system (recommended Wolo on-board air system is Model 840).
837 Cannon Ball Express Ev12 Truck Horn. Wolo MFG 887 Air Horn Express (TM) Tri Tone Train; Round Trumpets; 152 Decibels; 12 Volt/ 6 Amp Max; 10 Foot Of 1/4 Inch Outside Diameter; Semi Gloss Black; Stainless Steel. Add to registry. ✔. Wolo 837 Cannon Ball Express Air Horn.