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Service gladhand has air through it only when the brake is depressed and the emergency gladhand has air through it all the time. The emergency gladhand supplies air to fill the trailer air tanks and control the emergency brakes. Loss of air pressure in the emergency line causes the trailer...

I put two 25' in each vehicle so that I can reach all the tires on the vehicle with the hose as well as trailer tires, or another vehicle's tires if the vehicle is in an odd position. Two 25' hoses are more versatile than one 50' hose. I feel like having quick disconnects at every connection...