Vehicle snorkel
A vehicle snorkel is the land-based equivalent of the submarine snorkel
Submarine snorkel
A submarine snorkel is a device which allows a submarine to operate submerged while still taking in air from above the surface. Navy personnel often refer to it as the snort.-History:...

 which allowed submarines to use diesel engines while submerged. Snorkels, when used by vehicles with air-breathing internal combustion engines, allow limited deep fording capability for river crossing or amphibious landing operations.

Military wheeled vehicles, like Jeep
Jeep is an automobile marque of Chrysler . The first Willys Jeeps were produced in 1941 with the first civilian models in 1945, making it the oldest off-road vehicle and sport utility vehicle brand. It inspired a number of other light utility vehicles, such as the Land Rover which is the second...

s, are capable of mounting snorkels for the air intake and engine exhaust, to allow them to wade through relatively deep water, limited by the height of the driver's head. In the case of a Jeep, all of the engine openings and wiring are sealed, and the driver must first operate a damper that over-pressures the engine vacuum, to prevent water from entering. After fording, the vehicle's wheel bearing
Bearing (mechanical)
A bearing is a device to allow constrained relative motion between two or more parts, typically rotation or linear movement. Bearings may be classified broadly according to the motions they allow and according to their principle of operation as well as by the directions of applied loads they can...

s must be repacked with new lubricants. Tracked military vehicles such as tanks and armored personnel carriers
Armoured personnel carrier
An armoured personnel carrier is an armoured fighting vehicle designed to transport infantry to the battlefield.APCs are usually armed with only a machine gun although variants carry recoilless rifles, anti-tank guided missiles , or mortars...

 generally operate with all hatches sealed and the crew fully enclosed by the vehicle.

Such snorkelling equipment is available as an aftermarket
Aftermarket (automotive)
The automotive aftermarket is the secondary market of the automotive industry, concerned with the manufacturing, remanufacturing, distribution, retailing, and installation of all vehicle parts, chemicals, tools, equipment and accessories for light and heavy vehicles, after the sale of the...

 accessory for some civilian four-wheel drive
Four-wheel drive
Four-wheel drive, 4WD, or 4×4 is a four-wheeled vehicle with a drivetrain that allows all four wheels to receive torque from the engine simultaneously...

 vehicles. The snorkel is typically routed out through one of the front wings and up beside the "A" pillar to the level of the roofline where it is terminated with either a mushroom intake or a forward-facing intake.
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