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Freeze Plug 4 Pack - Side & Rear - E.D Billet - Cummins 12v & 24v 1989 - 2002 (EDC8902FPRBx4) -These machined Billet freeze plugs are perfect for your racing application! They bolt in so they will not blow out! -Helps prevent blow out at high rpm's, a weakness of stock -freeze plugs. -Machined in house at Engineered Diesel! At Engineered Diesel, we believe there is always a better way to do something. That's why we design and machine our own parts in house. When OEM doesn't get the job done, Engineered Diesel will. Whether you need a stronger alternative to a cheap OEM part or a custom part for your pulling truck, we have you covered!