Bykski G 1/4in. Stop Plug/Fill Port For 10mm ID Flexible Tubing (B-FS3J) - Silver
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Bykski G 1/4in. Stop Plug/Fill Port For 10mm ID Flexible Tubing (B-FS3J)

B-FS3J-S Only 9 left in Boise, ID
$16.99USDFree shipping over $125

US import duties and tariffs are included in every price.

Ships the same business day on orders placed before 2:00 PM MST. Overnight delivery available at checkout.
Ships directly from our Idaho inventory. You avoid overseas sellers, processing delays, international shipping, customs hold-ups and additional fees.
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Fittings for this part

PrimoChill SX fittings for the G1/4 ports, in stock in Boise. Pick a finish and how many you need; 6+ in any mix and the price drops.

Pick a finish, then add quantities.
Building your first loop? Plan the rest of it
Why buy it here
US warranty, handled in Boise
Claims are settled here, by the people who sold it to you.
Custom watercooling since 2002
PrimoChill, from Boise, Idaho.

About this part

Elevate the performance of your water cooling system with the Bykski G 1/4in. Sealing Stop Plug & Fill Port, specifically tailored for 10mm internal diameter flexible tubing. The B-FS3J model is crafted to merge flawlessly with your setup, offering both aesthetic appeal and high functionality.

In the box
  • 1 x Bykski G 1/4in. Sealing Stop Plug & Fill Port
  • 1 x Durable Seal Ring

Warning: This product is intended for DIY installation. The manufacturer will not be held responsible for any damage caused by incorrect use, which includes improper setup or combining with incompatible components or liquids. Responsibility for all associated risks rests with the user.

If the gallery shows a parts diagram, that diagram is the source of truth for what ships.
Datasheet
Thread TypeG 1/4in.
Tubing Compatibility10mm Internal Diameter Flexible Tubing
Build MaterialSuperior Brass
Color VariantsMultiple options to choose from
Seal Ring IncludedGuarantees a secure connection
SKUB-FS3J-S

What buyers said

Left by people who bought this part here. Compatibility reports are the useful ones — if you installed it, say which board.

Before you install it

This is a component, not an assembly — how it goes in depends on the loop it is joining. What does not change is the last step: leak test before power. Run the pump on a bench supply with the rest of the system unpowered. 24 hours is the standard, an hour is the minimum.

Custom water cooling is installed by you, at your own risk. We are not responsible for leaks, or for damage to your parts or system. If you're unsure at any step, ask before you power the loop.

Questions people ask about this part

Answers specific to B-FS3J-S. If yours isn't here, ask — we'd rather talk you out of the wrong part than sell you one.

What does this part fit?
Compatibility for this part is listed in the compatibility notes on this page. Parts like this are machined to a specific hardware layout, so send us your exact model and we will confirm it against part number B-FS3J-S before you order.
Is it in stock, and when will it ship?
Yes — only 9 left in Boise, Idaho. Orders placed before 2:00 PM MST on a business day ship the same day — we do not ship weekends or US holidays. Overnight delivery is available at checkout.
Can I return it if it turns out not to fit?
Yes. Returns are accepted within 30 days and are easy to start in the support center. Unopened items can be returned for store credit with no restocking fee; other returns carry a restocking fee, higher for items that have been installed or used. So we would rather check the fit with you first: send us the model and we will check it against this part.
Will I pay import duties or customs charges on delivery?
Not on a US order. US import duties and tariffs are already included in the price, so nothing is collected at the door and there is no brokerage fee. Orders shipped outside the US may owe that country's customs fees and duties.
Who handles the warranty?
PrimoChill, from Boise, Idaho. Every claim is handled directly by our support team rather than returned to an overseas factory. Installation is at your own risk: we are not responsible for leaks or damage to other hardware.
Is shipping free?
Shipping is free on orders over $125 to addresses in the lower 48 US states.
Are printed instructions included?
No printed manual is included. Installation references are in the product gallery images, and the install guides on this site cover the process step by step.
Do I need anything else to use it?
Check the parts list above against what you already have. If you are building a loop from scratch, send us the full parts list and we will tell you what is missing before you order.

Ask us before you order

Send your exact hardware model and we'll confirm the right part before you spend $16.99 — or tell you honestly that this isn't the one.

Returns are accepted within 30 days and are easy to start in the support center. Unopened items can be returned for store credit with no restocking fee; other returns carry a restocking fee, higher for items that have been installed or used.

Ask about compatibility