SKU: 31928122418

Cylinder 4 Cooling Connection

Sale price$60.26 Regular price$66.95
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Description

Cylinder 4 Cooling ConnectionThis kit is designed to help increase the cooling to the #4 cylinder on the Subaru EJ series engines. This hose kit connects to an existing port on the back of the left hand side of the motor that is blocked off from the factory with a plug. Compatibility: All Subaru EJ Series Motors Included in the kit: 10 Inches of Gates Engine Coolant Hose 10 AN 45 Degree Push To Connect Fitting 10 AN to Metric Straight Thread AdapterAluminum Crush Washer for

This kit is designed to help increase the cooling to the #4 cylinder on the Subaru EJ series engines. This hose kit connects to an existing port on the back of the left hand side of the motor that is blocked off from the factory with a plug.

Compatibility:
All Subaru EJ Series Motors

Included in the kit:

10 Inches of Gates Engine Coolant Hose
-10 AN 45 Degree Push To Connect Fitting
-10 AN to Metric Straight Thread Adapter
Aluminum Crush Washer for Metric Straight Thread Connection
304 Stainless Steel 5/8” Barbed Tee Connection
Qty 4 Stainless Steel Hose Clamps
12mm Allen Socket with 1/2” Square Drive


Basic Installation Steps:

  • Drain coolant from engine below the level of the plug on the back of the engine

  • Remove factory coolant plug using the supplied 12mm allen socket

  • Install straight thread to 10AN adapter with included aluminum crush washer

  • Test fit 10AN 45 degree fitting with hose attached

  • Locate heater core hose that connects to firewall and mark where to cut and install stainless tee fitting

  • Trim included Gates heater hose (different chassis and models require slightly different hose lengths)

  • Install tee connector inline with existing heater hose with the center connection being used for the provided line, use hose clamps on all 4 barbed hose connections

  • Tighten 10AN connection, ensure the new hose does not rub on any other parts in the engine bay paying close attention to the steering shaft

  • Refill coolant and properly “burp” the system to remove all air introduced during the installation

    *Note: If you see corrosion or surface imperfections on the sealing face of the block you can apply Permatex or similar sealing material to the metric straight threads on the adapter fitting into the block for a secondary sealing point. NEVER apply any type of sealant or tape to the threads on AN fittings.

This is a universal kit, depending on the year and chassis this is being installed on the length of heater hose and the point at which you connect into the factory hoses will be slightly different. We will be posting more detailed instructions and photos for each unique application very soon.

The intent of this kit is to solve an imbalance in the factory cooling system on the EJ series motors. Subaru designed the cooling system to ensure that cylinder #4 ran slightly hotter than the rest of the cylinders, this allowed them to then tune the system so that if knock were to occur is would happen first on cylinder #4. While this simplifies the control system on a factory car it doesn’t allow tuners to get the most potential out of the engines, the tune is basically limited by an intentional design flaw in the cooling system. Since this type of modification (not just our kit) can effect knock response on your engine we recommend consulting with your tuner before installation and having your tuner review logs after installation. Professional installation is recommended.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 31928122418

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Timothy Mousseau
Bozeman, US
★★★★★ 5
Neat gadget
Color: Gold
Neat little gadget. Works great, easy to use and has a light indicator for temperature range. Keeps a cup of liquid hot right to the bottom.
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Reviewed in the United States on May 29, 2026
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Ctg1363
San Leandro, US
★★★★★ 5
My tea stays warm to the bottom of the cup!!!
I am so glad I purchased this mug water. I drink tea all day but it cools down quickly. Since I purchased this mug warmer my tea stays hot to the bottom of the cup. The temperature is adjustable so you can keep your drink at your desired temperature. The top is glass and wipes clean easily. I like the rubber gasket that fits on top of the warmer. It keeps your mug in the center of the warmer and should you have a spill it catches the liquid. I've been using it every day for over a month now and it's going strong and is reliable. Perfect for personal use or as a gift.
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Reviewed in the United States on May 2, 2026
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Sarah Akin
Omaha, US
★★★★★ 5
Keeps my coffee as hot as I want it to be
Color: Silver
This coffee warmer is much better than the candle warmer that I was using for my coffee before. With a range of 3 temperatures, I have a choice of temperatures from hot to very, very hot, and the warmer shuts itself off after a while, just in case I forget. The description advises that ceramic cups do not retain heat as well as flat-bottomed cups, but I have not found that to be a problem. Coffee in my ceramic mug stays as hot as I want it to be. The knob on the side makes this warmer easy to turn on and to select a temperature, plus I feel that it is a good value.
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Reviewed in the United States on February 11, 2026
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Cecilia Tosh
Lexington, US
★★★★★ 5
Perfect Mug Warmer
Color: Black
I bought this to replace one I'd had for more than 25 years & I'm glad I got this one. Keeps my hot drinks hot for hours & will shut off after that. Quickly heats back up when needed. Very sleek looking. Easy to set up. Just take it out of the box & plug it in.
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Reviewed in the United States on February 12, 2026
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Amazon Customer
Lexington, US
★★★★★ 5
I love it for my workspace! Hot tea all day
Color: Wood Grain
I love this item. The size is perfect, as I prefer something less bulky for my work desktop. It isn't as fancy as others that has the digital display screen, which is fine by me, because I don't necessarily need that. The knob and different colors that indicate the temperature range works fine. The temperature on this thing works fantastically well for me. Using it on the lowest setting keeps my drink nice and hot in a cold office. I use a heatproof glass teapot with this and its a good fit. It keeps my tea hot throughout the day, so I am able to pour smaller amounts of drink and take my time sipping it throughout the day without worrying that it will get cold. At point I almost forgot that it has an automatic shut-off safety feature when I noticed it was off. So that is a good feature to have. I highly recommend this.
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Reviewed in the United States on January 15, 2026

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