Model 877-860
Quadraphonic Express™ PRO PLUS 
12-Volt 153 Decibels Hz

When a vehicle owner demands the powerful sound of a truck train horn, go no further, QUADRAPHONIC EXPRESS is the horn to choose. The four (4) metal trumpets produce a ULTRA powerful train horn sound that will be heard! QUADRAPHONIC has a heavy-duty mounting base which is constructed of solid steel to help prevent vibration. The horn is a bright triple chrome finish which means you will have a horn that looks as good as it sounds. Comes with mounting hardware and 10 feet of 1/4 inch O.D. nylon high-pressure hose.

The on-board air system provided is designed to produce a large volume of high-pressure air to power the SIBERIAN EXPRESS PRO PLUS TRAIN HORN and includes everything necessary for a professional installation. The extra heavy-duty 12-volt motor of the compressor is balanced to precision, and there are 4 heavy rubber bushings mounted into the base virtually eliminating all vibration. The pump produces 3.5 CFM for quick air recovery to the storage tank. For easy installation there is an extended length stainless steel high-pressure hose that allows the compressor to be surface mounted, the stainless steel hose connects the compressor to the 5-gallon metal air storage tank. Other features of the SIBERIAN EXPRESS PRO PLUS are; the tank has a built-in pressure switch, manual water drain, pressure gauge, pressure relief valve and brass fittings. Kit comes with mounting hardware, 10 ft. of flexible high-pressure hose and 20 ft. coiled filler hose with quality brass fittings.