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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4.5 ★★★★★
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RonL_SFO
Waukegan, US
★★★★★ 5
Works like it should, easier to use if you keep the dosing funnel on the basket
Color: Black, Color: Black
With a weighted top and storage base, this is sturdy metal with what appear to be standard acupuncture needles. It comes with a set of spare needles in a plastic tube. I find it much easier to use if I keep my dosing funnel on the basket, followed by a quick clearing of the funnel using a weighted espresso distribution tool with the maximum extension before popping off the funnel for my final tamp. See photo.
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Reviewed in the United States on March 11, 2026
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Verified Purchase
Silma mora
Chelsea, US
★★★★★ 5
Simple tool that makes a difference
Color: Black
This tool really improved my espresso. It’s easy to use and helps distribute the coffee evenly, which makes the shots come out better. It feels solid and well made. Small but very useful.
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Reviewed in the United States on March 18, 2026
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Vincent DiBona
Dallas, US
★★★★★ 4
It's not bad, but one minor issue FOR ME
Color: Black
There is nothing generally not to dislike about this WDT. Priced right. Good quality materials. But there are two issues that made me choose a different one, even before using this one: The entire top and bottom are straight cylindrical pieces. Ergonomically I would have to use more, larger muscle movement from my wrist to stir the beans. Not a big deal for some, but with other similar choices at the same price, I thought I would be better off with a different model. The second issue is that then the needles are placed back in the tall "recepticle", the top piece merely sits on top and isn't secured. For some that might be good because the top can be lifted out without any opposing force. OTOH, if it tips over it might expose the needles or need two hands to get it back together. If I didn't have other choices, I'd keep this one. I knew, without even using it that it wasn't for me... but it might be for someone else. Again, the materials are quite good and you can tell by the heft of the item. I elected to go with a similar concept, but a more contoured design with a knurled top and brushes on the inside of the recepticle to hold the needles and top in place, but also easy to extract for use. My choice over the Tiverain WDT was personal and has nothing to do with the quality of the product.
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Reviewed in the United States on February 9, 2026
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Elsie Suess
Pawtucket, US
★★★★★ 5
High quality and looks great
Color: Black
Works well, definitely deep enough. I like the stand- ease of lifting it off its base and then returning it without needing a second hand. Has a modern sleek look and it’s heavy in a good way. Feels like quality build.
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Reviewed in the United States on December 10, 2025
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Amazon Customer
Boise, US
★★★★★ 5
Nice accessory
Color: Black
Pretty useful tool for your espresso making experience
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 21, 2026

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