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Superlok Compression Tube Fittings

SRUI SERIES

Technical Specs

Primary Connection Range:
1/16" - 2" Fractional Tube
Secondary Connection Range:
Alt Primary Connection Range:
3mm - 25mm
Alt Secondary Connection Range:
Pressure Rating:
Limited by tubing selection
Body Material:
Stainless - 316L - Passivated
Port Size:
Orifice Size:
Seal Type:
Double Ferrule
Seal Material:
316L Stainless
Seat Material:

SRUI SERIES

Superlok reducing tube unions allow for two tubes a different sizes to be connected to each other. This is especially useful for manifold assemblies or adapting fractional to metric tubing.

This product also features Superlok's patented i-Fitting technology. Identified on the fitting by the red ring (or orange in the metric sizes.), this simple solution reduces the likelihood of leaks by reducing installation steps and the need for an additional gap gauge tool. Simply insert the tube to the stop and turn with a wrench until the red ring pops away for a perfect seal every time. This system is so dependable that we warranty them against leaks and failures for life!

i-Fitting technology is available on this product in sizes 1/4" through 1" and 6mm through 25mm

QUESTIONS ABOUT REDUCING UNION? CONTACT MAKO PRODUCTS TODAY!

Contact us today to learn more about our tube x tube reducing union fittings.

SRUI SERIES
TUBE X TUBE
REDUCING UNION‍

Compression Fittings Connect Fractional Tubes

If you need to connect two pieces of fractional tubing together at a junction that also reduces water pressure, we offer Superlok tube x tube reducing union fittings.

These pieces of hardware help to reinforce the safety of your tubing system while also offering you the ability to remove the connector at any time, which differs from other products. Other connectors require you to cut the tubing to disconnect it, but our inventory instead takes just a few turns to untighten the union.

Additionally, this versatility does not come at the expense of strength. Superlok uses top-tier materials and precision machining with every fitting, which allows them to handle strenuous conditions like temperature cycling, intense vibrations and continual pulsations. A size-appropriate solution is vital for creating leak protection, and we offer various sizes to meet your requirements.

Our i-Fitting system is another feature that sets these products apart from the field. Under- or over-tightening the fitting’s seal can create leaks and cause unnecessary strain on the tubes, both of which cost you money and reduce efficiency. The built-in gap gauge system will indicate when you reach optimal tightness.

Available tube sizes:
  • 1/8"
  • 3/16"
  • 1/4"
  • 5/16"
  • 3/8"
  • 1/2"
  • 5/8"
  • 3/4"
  • 1"
  • 6mm
  • 8mm
  • 10mm
  • 12mm
  • 16mm
  • 25mm
Available thread sizes:
  • 1/16"
  • 1/8"
  • 3/16"
  • 1/8"
  • 1/4"
  • 5/16"
  • 3/8"
  • 1/2"
  • 5/8"
  • 3/4"
Available adapter sizes:
  • 1/8"
  • 1/4"
  • 5/16"
  • 3/8"
  • 1/2"
  • 5/8"
  • 3/4"
  • 1"
  • 3mm
  • 4mm
  • 6mm
  • 8mm
  • 10mm
  • 12mm
  • 15mm
  • 16mm
  • 18mm
  • 20mm
  • 25mm

QUESTIONS ABOUT REDUCING UNION? CONTACT MAKO PRODUCTS TODAY!

Contact us today to learn more about our tube x tube reducing union fittings.

Cross Brand Part Number Look-Up

Size Superlok Swagelok Parker Hylok DK-LOK Hamlet Tylok Brennan Hoke SSP
1/8"T X 1/16"T SRU-2-1 SS-200-6-1 2RU1-316 CUR2-1-S316 DUR2-1-S 763L_1/8 X 1/16 SS-2-DRU-1 N2403-02-01-SS 2RU1316 ISSD2RU1
3/16"T X 1/8"T SRU-3-2 SS-300-6-2 3RU2-316 CUR3-2-S316 DUR3-2-S 763L_3/16 X 1/8 SS-3-DRU-2 N2403-03-02-SS 3RU2316 ISSD3RU2
1/4"T X 1/16"T SRUI-4-1 SS-400-6-1 4RU1-S316 CUR4-1-S316 DUR4-1-S 763L_1/4 X 1/16 SS-4-DRU-1 N2403-04-01-SS 4RU1316 ISSD4RU1
1/4"T X 1/8"T SRUI-4-2 SS-400-6-2 4RU2-316 CUR4-2-S316 DUR4-2-S 763L _ 1/4 X 1/8 SS-4-DRU-2 N2403-04-02-SS 4RU2316 ISSD4RU2
1/4"T X 3/16"T SRUI-4-3 SS-400-6-3 4RU3-316 CUR4-3-S316 DUR4-3-S 763L _ 1/4 X 3/16 SS-4-DRU-3 N2403-04-03-SS 4RU3316 ISSD4RU3
5/16"T X 1/8"T SRUI-5-2 SS-500-6-2 5RU2-316 CUR5-2-S316 DUR5-2-S 763L_5/16 X 1/8 SS-5-DRU-2 N2403-05-02-SS 5RU2316 ISSD5RU2
5/16"T X 1/4"T SRUI-5-4 SS-500-6-4 5RU4-316 CUR5-4-S316 DUR5-4-S 763L_5/16 X 1/4 SS-5-DRU-4 N2403-05-04-SS 5RU4316 ISSD5RU4
3/8"T X 1/16"T SRUI-6-1 SS-600-6-1 6RU1-316 CUR6-1-S316 DUR6-1-S 763L _ 3/8 X 1/16 SS-6-DRU-1 N2403-06-01-SS 6RU1316 ISSD6RU1
3/8"T X 1/8"T SRUI-6-2 SS-600-6-2 6RU2-316 CUR6-2-S316 DUR6-2-S 763L _ 3/8 X 1/8 SS-6-DRU-2 N2403-06-02-SS 6RU2316 ISSD6RU2
3/8"T X 1/4"T SRUI-6-4 SS-600-6-4 6RU4-316 CUR6-4-S316 DUR6-4-S 763L _ 3/8 X 1/4 SS-6-DRU-4 N2403-06-04-SS 6RU4316 ISSD6RU4
3/8"T X 5/16"T SRUI-6-5 SS-600-6-5 6RU5-316 CUR6-5-S316 DUR6-5-S 763L _ 3/8 X 5/16 SS-6-DRU-5 N2403-06-05-SS 6RU5316 ISSD6RU5
1/2"T X 1/16"T SRUI-8-1 SS-810-6-1 8RU1-316 CUR8-1-S316 DUR8-1-S 763L _ 1/2 X 1/16 SS-8-DRU-1 N2403-08-01-SS 8RU1316 ISSD8RU1
1/2"T X 1/8"T SRUI-8-2 SS-810-6-2 8RU2-316 CUR8-2-S316 DUR8-2-S 763L _ 1/2 X 1/8 SS-8-DRU-2 N2403-08-2-SS 8RU2316 ISSD8RU2
1/2"T X 1/4"T SRUI-8-4 SS-810-6-4 8RU4-316 CUR8-4-S316 DUR8-4-S 763L _ 1/2 X 1/4 SS-8-DRU-4 N2403-08-04-SS 8RU4316 ISSD8RU4
1/2"T X 3/8"T SRUI-8-6 SS-810-6-6 8RU6-316 CUR8-6-S316 DUR8-6-S 763L _ 1/2 X 3/8 SS-8-DRU-6 N2403-08-06-SS 8RU6316 ISSD8RU6
5/8"T X 3/8"T SRUI-10-6 SS-1010-6-6 10RU6-316 CUR10-6-S316 DUR10-6-S 763L _ 5/8 X 3/8 SS-10-DRU-6 N2403-10-06-SS 10RU6316 ISSD10RU6
5/8"T X 1/2"T SRUI-10-8 SS-1010-6-8 10RU8-316 CUR10-8-S316 DUR10-8-S 763L _ 5/8 X 1/2 SS-10-DRU-8 N2403-10-08-SS 10RU8316 ISSD10RU8
3/4"T X 1/4"T SRUI-12-4 SS-1210-6-4 12RUN-316 CUR12-4-S316 DUR12-4-S 763L_3/4 X 1/4 SS-12-DRU-4 N2403-12-04-SS 12RU4316 ISSD12RU4
3/4"T X 3/8"T SRUI-12-6 SS-1210-6-6 12RU6-316 CUR12-6-S316 DUR12-6-S 763L_3/4 X 3/8 SS-12-DRU-6 N2403-12-06-SS 12RU6316 ISSD12RU6
3/4"T X 1/2"T SRUI-12-8 SS-1210-6-8 12RU8-316 CUR12-8-S316 DUR12-8-S 763L _ 3/4 X 1/2 SS-12-DRU-8 N2403-12-08-SS 12RU8316 ISSD12RU8
3/4"T X 5/8"T SRUI-12-10 SS-1210-6-10 12RU10-316 CUR12-10-S316 DUR12-10-S 763L _ 3/4 X 5/8 SS-12-DRU-10 N2403-12-10-SS 12RU10316 ISSD12RU10
7/8"T X 3/4"T SRUI-14-12 SS-1410-6-12 14RU12-316 CUR14-12-S316 DUR14-12-S 763L_7/8 X 3/4 SS-14-DRU-12 N2403-14-12-SS 14RU12316 ISSD14RU12
1"T X 1/4"T SRUI-16-4 SS-1610-6-4 16RU4-316 CUR16-4-S316 DUR16-4-S 763L _ 1 X 1/4 SS-16-DRU-4 N2403-16-04-SS 16RU4316 ISSD16RU4
1"T X 3/8"T SRUI-16-6 SS-1610-6-6 16RU6-316 CUR16-6-S316 DUR16-6-S 763L_1 X 3/8 SS-16-DRU-6 N2403-16-06-SS 16RU6316 ISSD16RU6
1"T X 1/2"T SRUI-16-8 SS-1610-6-8 16RU8-316 CUR16-8-S316 DUR16-8-S 763L _ 1 X 1/2 SS-16-DRU-8 N2403-16-08-SS 16RU8316 ISSD16RU8
1"T X 5/8"T SRUI-16-10 SS-1610-6-10 16RU10-316 CUR16-10-S316 DUR16-10-S 763L _ 1 X 5/8 SS-16-DRU-10 N2403-16-10-SS 16RU10316 ISSD16RU10
1"T X 3/4"T SRUI-16-12 SS-1610-6-12 16RU12-316 CUR16-12-S316 DUR16-12-S 763L _ 1 X 3/4 SS-16-DRU-12 N2403-16-12-SS 16RU12316 ISSD16RU12
1-1/4"T X 3/4"T SRUI-20-12 SS-2000-6-12 20RU12-316 CUR20-12-S316 DUR20-12-S 763L_1-1/4 X 3/4 SS-20-DRU-12 N2403-20-12-SS 20RU12316 ISSD20RU12
1-1/4"T X 1"T SRUI-20-16 SS-2000-6-16 20RU16-316 CUR20-16-S316 DUR20-16-S 763L_1 1/4 X 1 SS-20-DRU-16 N2403-20-16-SS 20RU16316 ISSD20RU16
1-1/2"T X 3/4"T SRUI-24-12 SS-2400-6-12 24RU12-316 CUR24-12-S316 DUR24-12-S 763L_1 1/2 x 3/4 SS-24-DRU-12 N2403-24-12-SS 24RU12316 ISSD24RU12
1-1/2"T X 1"T SRUI-24-16 SS-2400-6-16 24RU16-316 CUR24-16-S316 DUR24-16-S 763L_1 1/2 x 1 SS-24-DRU-16 N2403-24-16-SS 24RU16316 ISSD24RU16
2"T X 1/2"T SRUI-32-8 SS-3200-6-8 32RU8-316 CUR32-8-S316 DUR32-8-S 763L_2 X 1/2 SS-32-DRU-8 N2403-32-8-SS 32RU8316 ISSD32RU8
2"T X 1"T SRUI-32-16 SS-3200-6-16 32RU16-316 CUR32-16-S316 DUR32-16-S 763L_2 X 1 SS-32-DRU-16 N2403-32-16-SS 32RU16316 ISSD32RU16

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