Fittings & adapters

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G1/4 compression fittings for soft tubing, hard tube fittings, angled and rotary adapters, extensions, quick disconnects and plugs from EK, Bitspower and Barrow. Filter by type, tube size and color, and pay in BTC, ETH or USDT.

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Buying fittings & adapters at HodlChip

Fittings connect tubing to blocks, radiators and reservoirs. Almost every PC water cooling part uses G1/4" threads, so fittings work across brands. Match the tubing first:

  • Soft tubing: compression fittings are sized by outer and inner diameter, for example 13/10 or 16/10 mm. The Tube size filter shows each fitting's size.
  • Hard tubing: hard tube fittings are sized by outer diameter, usually 12, 14 or 16 mm, and seal with O-rings. Use the For hard tubing filter.
  • Adapters and extensions: 90° and 45° rotary adapters, male-to-female extensions and multi-port blocks solve awkward angles and spacing.
  • Quick disconnects and plugs: quick disconnects let you remove a radiator or graphics card without draining the loop; a drain fitting at the lowest point makes maintenance easier.

Keep to one tube size per loop, and buy a few spare fittings, as running short mid-build is common. Each angled fitting adds a little flow restriction, so use them where they save a bend, not everywhere. Tighten fittings by hand: too much force can crack acrylic block tops. Find tubing in tubing and tools in loop tools & accessories, and plan the loop with our custom water cooling guide.

Going deeper: Custom water cooling guide for beginners (2026)

Questions about fittings & adapters

What size fittings do I need?
Match the fitting to your tubing: compression fittings for soft tubing by outer and inner diameter, such as 13/10 or 16/10 mm, and hard tube fittings by outer diameter, such as 12, 14 or 16 mm. The thread on the other side is the standard G1/4".
Can I mix fittings from different brands?
Yes. G1/4" threads are standard, so fittings from one brand screw into blocks and radiators from another. Keep the tube size consistent across the loop, and check that each O-ring sits flat against the port.
Do angled fittings reduce flow?
Each angled or rotary fitting adds a small restriction. A few make no practical difference in a typical loop with a D5 or DDC pump, but a long chain of adapters adds up, so plan tube runs to keep them to a minimum.