Item DTZ04287987 has must read information.
: Per the vendor this gasket is used for calibrating EGR flow and is available in several versions, each having a different sized hole in the center. For proper service replacement please obtain the serial number of the engine and contact the JLG Ground Support Parts Team @ 1-877-JLG-LIFT (1-877-554-5438). 

DTZ-GASKET

$11.07
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DTZ04287987

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EA
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DTZ-GASKET - DTZ04287987