Product Details: Prepare your semi truck to be Ready for the Road Ahead™, with the Tramec 1/4-18 NPTF Trailer Emergency Valve that provides enhanced trailer security. Thanks to its sophisticated design, this replacement component is able to deliver compressed air to trailers in case of loss of air pressure. Fashioned with an easy to install compact size to be gentle on tanks. FleetPride is your First Click in Heavy Duty®.