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Swiftech 3/8IN X 5/8IN LOK-SEAL™ Compression Fitting G1/4 - Black

This product can only be exchanged or replaced with the exact same item.
Swiftech 3/8IN X 5/8IN LOK-SEAL™ Compression Fitting G1/4 - Black - 1
Actual product may not be exactly as shown.
Swiftech 3/8IN X 5/8IN LOK-SEAL™ Compression Fitting G1/4 - Black - 72219_l.jpg Customer Photos (0)

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Reg. Price: $9.98  CAD
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   Shipping Weight:   0.1 lbs
   Part #: 5-8x3-8-G1-4-CF-BK

Features    [ Edit | History ]

Product Description: 


?” x ?” Lok-Seal™ Compression Fitting


Contents & Features


  • Blister pack of 1 fitting & collar
  • Material: brass
  • For ?” (10mm) ID x ?” (16mm) OD tubing
  • Finish: high polish chrome plating or black paint
  • G 1/4" Male threads
  • Hex nut:
    • Inch: 13/16"
    • Metric: 20mm
  • Collar:
    • Inch: .83"
    • Metric: 21mm
  • Hi-flow design: .40" (10.2mm) bore  ID x  .40" (10.2mm) barb ID







Recommended use

  • Initial Tip:  If possible, attach the fittings to the cooling devices first! While not mandatory,  it is always preferable to fasten a fittings to a cooling device prior to installing the device inside the case. This will eliminate interference issues that may be encountered when working with tools inside of space constrained enclosures.
  • Fasten the fitting by hand until it mates with the surface of the cooling device. The amount of force necessary to screw the fittings down in “finger tight” mating position may vary from one device to another depending on various factors.  Users are advised to always visually check on the actual position of the fitting relative to the device surface rather than solely relying on feel. There should be little -not to exceed the thickness of a sheet of paper, or no visible gap between the fitting lower lip and the device surface. See the illustration below.


  • For complete long-term safety and leak-free operations, Swiftech® recommends that the fittings be locked in place using the recommended tools and that the torque levels specified below be applied:

Recommended Torque

Soft Material


Maximum (*)

Acetal (POM) and acrylics

1/4 of a turn after initial contact between mating surfaces

1/2 of a turn after initial contact between mating surfaces

Hard Materials


Copper, brass, aluminum

1/8 of a turn after initial contact between mating surfaces

(*) For full 5mm thread depth – please inspect the device threads prior to applying the maximum
recommended torque – when partial threads exist due to application necessity, only apply the
minimum torque.


Recommended Tools

A small adjustable wrench with jaw opening up to 1” (25.4mm)

may be used as a universal tool instead of the specific tools listed below

Specific tool sizes



Inch Tube ID x OD

Metric Tube OD xID

Fitting base hex:


Flat wrench or socket



Flat or adjustable wrench

?”x ½” – 13/10mm

Metric: 17mm - Inch: 11/16”

Metric: 18mm - Inch: adjustable wrench

?” x ?” – 16/10mm

Metric: 20mm - Inch: 13/16”

Metric: 21mm - Inch: adjustable wrench

½” x ¾” – 19/13mm

Metric: 24mm - Inch: 15/16”

Metric: 25mm - Inch: 1”


Swiftech 5-8x3-8-G1-4-CF-BK Customer Reviews

Product reviews on are screened for relevance and inappropriate content. Reviews may contain inaccurate information about the product. If there is a discrepancy, please use the Flag this Review link located beside each review. Reviews are not an endorsement expressed by, but opinions from customers based on their own experience with a product. We do not recommend you make purchasing decisions based on facts or opinions expressed regarding Swiftech 5-8x3-8-G1-4-CF-BK reviews.
Experience: 1 Days
 Verified Owner
great looking, cheap, easy to use with tools
once the tube is on, the compression ring is really hard to screw into place compared to other fitting i got from other brands
definitely recommand it, the are really great looking, but the compression ring is a bit hard to screw into place ...

Experience: 2 Weeks
 Verified Owner
-Fits into blocks, radiators and reservoirs well. That's it.
- the compression nut is so hard to put on once the tube is on. I am having a tough time typing this review since my fingers still hurt!!!!
- the black is not a deep black like in the picture above. Seems that not enough black paint was applied. The brass/copper shows through. So it's more a dark brown colour.
I gave it a 1 star but ncix wouldn't post it or was taking to long. Read fully. Don't buy. Yes it's cheaper than other brands but I guess the old saying is true, "you get what you pay for". Once the tube is on, it is so hard to put on the compression nut. It won't even reach the threads to begin with. You have to use so much force that it is ridiculous. I was being so cautious when working on my rad so as not to crush the fans that are behind it. I used primochill advanced lrt 3/8 and 5/8. At first I thought perhaps the tubing was not made to proper size. So I tested it on a different brand quick disconnect and that went on like butter, stayed on too. Save your fingers buy another brand.

This review was modfied by poster @ 02-16-14 07:10 AM

Fraser Cow
Experience: 2 Months
 Verified Owner
Good price
Look better then barb fittings.
If you don't want to spend $100.00 on fittings, this is a really good option.

Experience: 30 Days
 Verified Owner
high quality
not free
easy to use. like the wrench flats

Experience: 30 Days
 Verified Owner
- Look amazing
- High Quality
- No leaks
- Easy Installation
Have these on my current set-up and have had no problems at all with these. So easy to install and reliable I would recommend these fittings over barbs. They just look so much nicer.

Experience: 2 Weeks
 Verified Owner
High quality
Looks great
Has flat ends so tightening with a wrench is easy and won't damage it.
Can be a bit tight
Excellent compression fittings. Look great, feel great, and no leaks whatsoever.
Easy to use with tools too.

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