Tractor protection valves are usually mounted at the rear of the cab. Their job is to protect the tractor air brake system in the event of a trailer breakaway or severe air leak. They are also used to shut off air to the trailer before disconnecting the lines.

PTP 279000 TP3 Tractor Protection Valve

PTP 279000 TP3 Tractor Protection Valve

Part# 061-279000R

$68.39 USD

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Would recommend this product.