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White brass expansion joint with diamond knurling, adjustable from 21mm to 31mm

Bykski

Bykski G 1/4in SLI/CF Expansion Joint 21mm-31mm White

SKU CH-J68Q-FA4F1

Adjustable brass expansion joint bridges GPU blocks with G 1/4in threads from 21mm to 31mm

  • Product typeCPU Block
  • Product colorWhite
  • Bridges GPU blocks with adjustable 21mm to 31mm spacing
  • Diamond knurled brass body provides secure grip during installation
  • G 1/4in thread fits standard water-cooling fittings
  • Brass construction suits non-aluminium custom loops
  • Length adjusts without tools for quick alignment

Expansion Joint for Multi-GPU Loops

This white brass fitting bridges the gap between two GPU water blocks in an SLI or CrossFire loop. It threads onto any G 1/4in port and adjusts from 21mm to 31mm to match uneven block spacing. The diamond-knurled surface gives a secure grip during installation.

Replaces Fixed-Length Rigid Bridges

Builders who previously used solid acrylic or fixed metal bridges gain the ability to fine-tune spacing without cutting new tubing. The adjustable range is worth it when block ports do not align perfectly or when mixing blocks from different manufacturers. It does not suit single-GPU loops or builds that need a permanent rigid link.

Limits of G 1/4in Brass in Custom Loops

The joint fits standard G 1/4in threads but must stay in non-aluminium loops to avoid galvanic corrosion. Internal finish may react with distilled-water coolants and is confirmed incompatible with PrimoChill Opaque and VUE series fluids. Buyers planning those coolants or mixed-metal loops should choose a different connector.

How it compares

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

Price $19.99
Pricier than about 61% of the 609 comparable items (median $15.99).

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Specifications

Product
Product typeCPU Block
Product colorWhite

Questions about this item

What thread size does the Bykski expansion joint use to connect to GPU blocks?

The joint uses standard G 1/4in threads on both ends, so it fits any component with the same thread pitch.

How do you adjust the 21mm to 31mm length without causing leaks?

Loosen the knurled collar, slide the inner section to the desired spacing, then hand-tighten the collar firmly; the internal O-ring seals the overlap.

Which coolants should be avoided to prevent damage to the brass finish?

Do not use DI water-based coolants, PrimoChill Opaque, or PrimoChill VUE series, as the internal finish reacts with those fluids.

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