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Silver compression fitting with knurled collar and G1/4 thread

Barrow Mods

Barrow Mods THKN-3/8-B03-Silver G1/4" 3/8" ID 1/2" OD compression fitting silver diy cooling

SKU CH-C3B4-SQJX4 MPN THKN-3/8-B03-Silver

Connects 3/8" ID, 1/2" OD tubing to G1/4" water-cooling ports with a leak-proof compression seal

  • Key featuresIdeal for all other components which use a G1/4 in thread ty

Color Silver

  • Secure leak-proof seal with standard G1/4" thread and rubber o-ring
  • Compatible with 3/8" ID x 1/2" OD tubing for custom loops
  • Silver compression fitting designed for DIY water cooling builds
  • Screws securely into water cooling components for reliable connections
  • Ideal for all components using G1/4" thread type

G1/4" Compression Fitting for Custom Loops

This silver compression fitting connects 3/8" inner-diameter by 1/2" outer-diameter tubing to any component with a standard G1/4" thread. It is designed for builders assembling a custom water-cooling loop who need a secure, leak-resistant joint.

Upgrade from Push-On Barbs or Worn Fittings

The compression design clamps the tube wall evenly, removing the risk of blow-off that simple barbs can suffer under pressure. Switch when you want a reusable seal that does not rely on hose clamps or when existing fittings show corrosion or stripped threads.

Verify Tubing Dimensions and Thread Compatibility

Confirm your tubing measures exactly 3/8" ID and 1/2" OD, as other sizes will not seal correctly. Check that every block, radiator, pump and reservoir you plan to connect exposes a G1/4" female port. Ensure you have space to tighten the collar by hand or with a soft-jaw wrench.

How it compares

Measured against everything we stock in Heatsinks & Water Blocks, at today’s prices. Recalculated every night.

Price $7.99
Cheaper than about 80% of the 609 comparable items (median $15.99).

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Specifications

Product
Brand nameBarrow
Model nameTHKN-3/8-B03-Silver
Part numberTHKN-3/8-B03-Silver

Other versions of this model

5 more in the same range

Questions about this item

What thread size does this fitting need on the component side?

It uses a standard G1/4" thread with a rubber o-ring to seal securely into water cooling components.

How is the tubing secured once the fitting is threaded in?

Slide the 3/8" ID x 1/2" OD tubing over the barb and tighten the compression collar to clamp it in place.

Which part of this fitting should be checked or replaced during loop maintenance?

The rubber o-ring on the G1/4" thread should be inspected for wear and replaced if it shows cracking or flattening.

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