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Black compression fitting with G1/4 thread for 3/8 ID tubing

Barrow Mods

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

SKU CH-YBKE-G1SP7 MPN THKN-3/8-B03

Connects 3/8" ID 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 Black

  • Secure leak-proof seal with rubber o-ring
  • Standard G1/4 thread fits water cooling components
  • Compression design for 3/8" ID x 1/2" OD tubing
  • Black and dark blue finish matches build aesthetics
  • New condition ready for DIY cooling assembly

Barrow G1/4 compression fitting for custom loops

This black compression fitting accepts 3/8 in inner‑diameter and 1/2 in outer‑diameter tubing and threads into any component with a standard G1/4 in port. It is intended for builders assembling a custom water‑cooling loop who need a secure, leak‑proof connection.

G1/4 thread limits and tubing compatibility

The fitting only seals against a G1/4 in female thread and the supplied rubber o‑ring; it will not fit metric or NPT ports without an adapter. Tubing must match the 3/8 in ID and 1/2 in OD dimensions exactly, otherwise the compression ring cannot grip and seal.

Check your loop components before ordering

Verify that every block, radiator, pump and reservoir you plan to use provides a G1/4 in thread for this fitting. Confirm your tubing is 3/8 in ID by 1/2 in OD, and ensure you have enough fittings for each connection point in the loop.

How it compares

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

Price $6.99
Cheaper than about 90% of the 609 comparable items (median $15.99).

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Specifications

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

Other versions of this model

5 more in the same range

Questions about this item

Should I pick the 3/8" ID × 1/2" OD size or a different tubing match?

Choose this fitting only if your tubing is exactly 3/8" inner diameter and 1/2" outer diameter; other sizes will not seal.

What does the G1/4" thread actually give me inside the loop?

It screws into any standard water-block, radiator or pump port with a rubber O-ring for a leak-proof seal.

Does the compression design limit tubing choice or pressure rating?

The compression ring grips 3/8" ID × 1/2" OD tube directly; no barbs or clamps are needed, and it holds typical loop pressures.

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