Restrictor replaces the thermostat to control the flow of water through the cooling system. Kit contains three 2-1/8' O. D. aluminum restrictors with 5/8', 3/4' and a 1' center I. D. hole that fit most GM V8 or V6 and SB Ford water outlets.
Allstar Performance ALL30241 Water Outlet Restrictor Kit
by NeweggConsumer Electronics
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