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Liquid Cooling Quick-Disconnect Comparison

The accompanying CSV compares various liquid cooling quick-disconnect couplers that satisfy the following criteria:

  • No-spill (<100µL loss on disconnect)
  • Hand mate (requires releasing an interlock to disconnect)
  • Material compatible with a copper loop (e.g., brass, plastic, stainless steel)
  • 0~60°C operating temperature
  • Nominal inner diametre of 6~10mm

Note: Various vendors offer couplers following the UQD standard, but at the time of writing, all either don't provide public datasheets or the datasheets are incomplete, so they're not included in this comparison. Perhaps UQD is still too immature of a standard

The superscript numbers are footnotes corresponding to:

  1. Cv and Kv are numbers directly provided by the manufacturer, or calculated from the flow-pressure drop graph at Q≈4L/m
  2. AUD price of a male+female pair at single quantities. Missing prices means I couldn't find any publically available price and haven't asked for a quote
  3. Female length with a 10mm ID barb termination (or nearest size)
  4. Male length with a G 1/4 male thread termination (or nearest size)
  5. No barb termination available (or datasheet does not include barb length), so threaded termination used with extra length added on to represent a barb fitting (+23mm for G 1/4, +34mm for G 3/8, +45mm for G 1/2)
  6. No male thread available, so used female thread instead
  7. Cannot be disconnected under pressure
  8. Nitrile seal material (+$15 for FKM or EPDM)
Product Cv¹ Kv¹ AUD ex. GST² Spillage (µL) Pressure (bar) Diametre (mm) F Length³ (mm) M Length⁴ (mm) Panel Mount Barb Termination Options (ID mm) Polytube Termination Options (ID×OD mm) BSP Termination Options NPT Termination Options Other Termination Options Price Source
10mm ID, 1m length pipe (Ref) 2.8 2.4
UQD04 (Ref) 0.8 0.7 25 6.9 26 10 ISO11926-3 -06 ORB
UQD06 (Ref) 1.6 1.4 35 6.9 29 13 ISO11926-3 -08 ORB
Alphacool Eiszapfen⁷ 1.2 1.0 $50 24 65⁵ 40 G 1/4 https://www.alphacool.com/shop/fittings/quick-release-connectors/
CEJN Non-Drip 467 1.3 1.1 $185 20 29 79⁵ 52⁶ × G 3/8 3/8" https://au.rs-online.com/web/c/plumbing-pipeline/pipe-fittings-accessories/process-fittings/?applied-dimensions=4294966989
CEJN Non-Drip 567 2.4 2.1 $226 20 34 98⁵ 57⁶ × G 1/2 1/2" https://au.rs-online.com/web/c/plumbing-pipeline/pipe-fittings-accessories/process-fittings/?applied-dimensions=4294966989
CEJN ultraFLOW 288 1.0 0.9 10 25 81⁵ 51 × G 1/4, G 3/8
CEJN ultraFLOW 488 3.4 2.9 10 30 94⁵ 54 × G 3/8, G 1/2
CPC LQ4 1.4 1.2 $171 25 8.3 25 69 55 × 6.4, 9.5 6.4×9.5 G 1/4, G 3/8 1/4", 3/8" 1/4 SAE-4, 3/8 SAE-6 https://www.vfv.com.au/industrial/quick-connects.html?series=151
CPC LQ6 2.2 1.9 $193 30 8.3 32 76 62 × 9.5, 12.7 9.5×12.7 G 3/8, G 1/2 3/8" 3/8 SAE-6, 1/2 SAE-8 https://www.vfv.com.au/industrial/quick-connects.html?series=152
CPC NS4 0.6 0.5 $58 100 8.3 27 60 50 3.2, 6.4, 9.5 4.3×6.4, 5.4×9.5 R 1/4 1/4" https://www.vfv.com.au/industrial/quick-connects.html?series=114
CPC NS6 2.2 1.9 $73 30 8.3 34 81 62 9.5, 12.7 R 1/2 1/2" 12.7mm OD compression https://www.vfv.com.au/industrial/quick-connects.html?series=188
CPC PLQ4 1.4 1.2 25 8.3 27 69 54 × 6.4, 9.5 G 1/4 1/4 SAE-4, 3/8 SAE-6
Koolance QD3⁷ 1.6 1.4 $39 200 7.8 24 51 36 10, 13 10×13, 10×16, 13×16, 13×19 G 1/4 1/4" https://koolance.com/quick-disconnect-couplings-low-pressure-qd3
Koolance QD3H 1.6 1.4 $48 200 11.7 24 57 41 10, 13 G 1/4 1/4" https://koolance.com/quick-disconnect-couplings-high-pressure-qd3h
Koolance QD4⁷ 2.9 2.5 $45 200 7.8 28 52 40 × 13×19 G 3/8 3/8" https://koolance.com/quick-disconnect-couplings-low-pressure-qd4
Nitto Kohki CZL-2 1.3 1.1 $142 23 10 19 79⁵ 40 × R 1/4 https://www.askul.co.jp/v/000581577/
Nitto Kohki ZEL-2 1.2 1.0 $72⁸ 60 35 28 79⁵ 39⁶ × R 1/4 https://www.askul.co.jp/v/000386276/
Nitto Kohki ZEL-3 2.4 2.1 $116⁸ 120 35 35 100⁵ 45⁶ × R 3/8 https://www.askul.co.jp/v/000386276/
Parker FS 3/8" 1.8 1.6 $470 15 138 33 98⁵ 59⁶ × 3/8" 3/4" UNF https://www.valinonline.com/manufacturers/parker/fs-series
Parker FS 1/2" 3.0 2.6 $601 20 138 41 115⁵ 70⁶ × 1/2" 7/8" UNF https://www.valinonline.com/manufacturers/parker/fs-series
Parker NSI 6 0.8 0.7 $177 10 60 22 81⁵ 55 × G 1/4 M16 https://tidyco.co.uk/store/parker-hannifin/parker-warehouse.asp?prod_disc_code=05DIS90&catheader=Quick%20Release%20Couplings&wh=05
Parker NSI 9 2.1 1.8 $423 40 60 30 106⁵ 73 × G 3/8 https://www.sp-spareparts.com/en/b/parker-hannifin/pneumatics/accessories/coupling
Parker NSS 3/8" 1.3 1.1 20 20 29 92⁵ 47⁶ 9.5, 12.7 9/16" UNF, 3/4" UNF, 9.5mm OD compression, 12.7mm OD compression
Parker NSS 1/2" 3.0 2.6 70 20 36 121⁵ 76⁶ 12.7, 19 7/8" UNF, 1 1/16" UNF, 12.7mm OD compression, 19mm OD compression
Stäubli RME09 2.4 2.1 16 25 99⁵ 60 × G 3/8 3/8" M18
Stäubli SCG06 1.1 1.0 16 27 80 43 × 10 G 1/4
Stäubli SCG09 2.6 2.2 16 33 96 57 × 13 G 3/8, G 1/2 UN 3/4-16
Swiftech Lok-Seal⁷ 1.4 1.2 $54 200 7 26 9.5×12.7, 9.5×16, 12.7×19 G 1/4 https://www.swiftech.com/Quickdisconnect.aspx
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