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Ships within 48 hours · Estimated delivery Jul 17 - Jul 22
For Your Every Summer RSVP, with Code: SUMMER15
Description
Fleece Performance Coolant Bypass Kit 06-07 5.9L Auto Trans CumminsHelp eliminate the chance of scored rear cylinders and blown freeze plugs on your 5. 9L Cummins with this Coolant Bypass Kit from Fleece Performance! The Fleece Coolant Bypass solves the problem of excessive coolant pressure before it becomes a problem. The integrated secondary thermostat locates at the back of the block and allows coolant to flow freely when at normal operating temperatures ensuring consistent temperatures across all six cylinders
Help eliminate the chance of scored rear cylinders and blown freeze plugs on your 5.9L Cummins with this Coolant Bypass Kit from Fleece Performance! The Fleece Coolant Bypass solves the problem of excessive coolant pressure before it becomes a problem. The integrated secondary thermostat locates at the back of the block and allows coolant to flow freely when at normal operating temperatures ensuring consistent temperatures across all six cylinders and eliminates excessive pressure. The kit comes with high quality AN o-ring fittings and AN hose connections with braided hose to ensure a leak free installation and installs in two hours or less!Increased Coolant Flow, Decreased Coolant Temperatures - The rear cylinders on the 24 Valve Cummins suffer from a lack of coolant flow, and therefore, experience the highest coolant temperatures. This can cause excessive pressure to build in the cooling system, especially the rear of the block and blow out freeze plugs externally, or the smaller diameter plugs under the valve cover, leading to a failure. Fleece's coolant bypass kit adds a secondary thermostat, that unlike other brands, works based on temperature instead of excessive pressure. This solves the problem before pressure becomes an issue by ensuring consistent temperatures across all six cylinders.
Why do I need a Fleece Coolant Bypass? - One of the biggest issues on the 24 valves is the coolant flow problem to the rear cylinders. This can cause catastrophic failure or blow outs of the freeze plugs in an over-temperature / over-pressure condition. The Fleece Coolant Bypass is one of the most important additions you make to improve the reliability and longevity of the Cummins platform.
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4.1 ★★★★★
Based on 16 reviews
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Product Reviews
★★★★★ 5
Perfect Dog Toy and hard to find
Color: Large size (7.9")
Hard to find toy. My dogs favorite toy and this is a really good price.
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Reviewed in the United States on April 25, 2026
★★★★★ 1
Not strong. Didn't last
Color: Large size (7.9")
Was ripped apart very quickly. Not strong. Would not buy again
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Reviewed in the United States on May 10, 2026
★★★★★ 4
Keeps her busy!
Color: Medium size (5.9")
Our Molly loves this. Only thing is that it is a little too big for our Maltipoo, but she still tries to keep up with it.
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Reviewed in the United States on April 29, 2026
★★★★★ 5
Tough
Color: Medium size (5.9")
So far my dog hasn’t destroyed it! And it’s been a month. So I call that a win. Plus he loves it.
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Reviewed in the United States on May 26, 2026
★★★★★ 5
Picky dog approved!
Color: S6-muti-color, Color: S6-muti-color
I have wasted so much money on dog balls that they won't even pick up! They finally were obsessed with the Kong rubber green/blue or red/blue ones, but they're $3+. each, and they break from the dogs squishing it. I honestly had zero expectations on these, and they BOTH picked them up on the first throw! That's huge!!
Seem to work fine in the ChuckIt.
As for the squeaker, at first I was like "Oh nooooo." when they both loudly started! Much to my (and my neighbors') happiness, the squeakers stopped working after a couple minutes. 🤣
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Reviewed in the United States on February 2, 2025