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In order to come up with the Best Compression Union Straights (2021), our brilliant platforms and gurus have taken many criteria into account such as product fitness for use, user-friendly features and give buyer satisfaction, defect-free, conformance of standards, value-for-money, reliability, quality of design, quality conformance to user requirements and good practises, health and safety, actual buyer satisfaction and lots of others. It is of great importance to mention that each user has different requirements so please consider the below shortlist as a guide and not as a gospel. Nonetheless, in the shortlist below you can undoubtedly find the overall best ones despite your requirements.

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Best Compression Union Straights

Best Choice No. 1
Vis Compression Union Straight, 3/8″ OD x3/8 inch OD COMP Brass Tube Fittings (Pack of 5)
  • Union Straight for connecting and disconnecting two tubes more easily than with a coupling
  • Compression tube connections on both ends
  • Brass for corrosion resistance, ductility at high temperatures, and low magnetic permeability
  • Operating temperature range of -65 to +250 degrees F
  • Three piece construction – nut, sleeve and body
Best Choice No. 2
RFS Stainless Steel SS316 Compression Union Fitting, 5/16″ OD, Double Ferrule Union Coupling Adapter Connector, Heavy Duty Twin Ferrule for Hydraulic Plumbing System
  • Double ferrule union coupling attach and detach pipes without leaving deformities. Two compression ends.
  • Working pressure between 2000 PSI to 10000 PSI, depending on the tube’s wall thickness.
  • Made of stainless steel 316 grade, with higher resistance against corrosion and rust.
  • Ensure an excellent and reliable sealing in both low and high pressure applications with strong mechanical grip design. Easy to use, leakage-free, and high durability.
  • Also known as twin ferrule, double ferrule, and instrumentation fittings.
Best Choice No. 3
LOZOME 304 Stainless Steel Compression Fitting,Union,Straight Adapter with Twin Ferrules,3/8″ Tube OD
  • Size: Tube OD 3/8″; Ferrule Inner Dia : 3/8″
  • Twin ferrule compression fitting for a leak-resistant seal in high-pressure applications
  • Material: 304 stainless steel
  • Working Pressure: 0-20mpa | 0-2900psi.Working Temperature: -50- 450°C | -58~842°F
  • Fitting connects to tubing on both ends,Union for connecting and disconnecting two pipes more easily than couplings
Best Choice No. 4
Megairon D6 6mm Stainless Steel Equal Straight Adapter Compression Tube Fitting,Union,Coupler Double Ferrule Tube Pipe Fitting
  • Dual couplings for joining two tubes of the same diameter
  • Stainless Steel construction for durability and resistance to corrosion
  • Double Ferrule Tube Fittings provide torque free, leak proof joints at all tubing
  • Connections and prevent costly and hazardous leaks in process and instrumentation tubing
  • Back ferrules hold tubing tight within the body of the fitting while front ferrules hold tubing tight through the nut
Best Choice No. 5
Metalwork Metric Nickel Plated Brass Compression Tube Fitting, Union, Double Sleeve Straight Connector, 8mm OD x 8mm OD, Pack of 2
  • Three piece construction – nut, sleeve and body with attached insert Use with copper, brass, aluminum, or plastic tubing
  • High Pressure Resistance, Temperature Resistance
  • Seal ability and good repeatability, Easy to disassemble no flaring tool required
  • Installation and maintenance convenient
  • Safe and reliable, Nickel plated brass construction
Best Choice No. 6
Horiznext Stainless Steel Compression Tube Fitting, Union, 3/8″ Tube OD Straight Adapter
  • Made of stainless steel 304, heavy duty, durable and corrosion resistance.
  • 3/8″ outer diameter tube
  • Fittings for connecting and extending stainless steel, copper, rigid and semi-rigid plastic tubing
  • Maximum working pressure of 2000 psi
  • Temperature range from -212 to +1472 degrees ℉
Best Choice No. 7
Beduan 304 Stainless Steel Compression Tube Fitting, 1/2″ x 1/2″ Tube OD, Straight Connect, Double-Ferrule Adapter
  • 304 Stainless Steel
  • Coupler Ferrule Mini Inner Dia : 1/2“
  • Adapter for connecting pipes or fittings of different types.
  • High Qunatity : This fitting is made of chemically hardened type 304 stainless steel that provides higher strength and greater corrosion resistance than untreated stainless steel.
  • Double ferrule fitting reduces possibility of leakage
Best Choice No. 8
Boeray 5pcs Brass Tube Fitting, 5/16″ to 5/16″ Compression Union Fitting
  • Material:CA 360 brass,high quality, provide high resistance to abrasion and corrosion.
  • Size: 5/16″ x 5/16″
  • Union for connecting and disconnecting two tubes more easily than with a coupling
  • Temperature Range:-65 to +250 degrees F
  • Use with:copper, brass, aluminum, or plastic tubing.Primary uses water, gasoline, oil and vacuum lines. It is very convenient
SaleBest Choice No. 9
John Guest Acetal Copolymer Tube Fitting, Reducing Straight Union, 1/2″ x 3/8″ Tube OD (Pack of 10)
  • Reducing straight union for connecting and disconnecting two inline pipes of different diameters more easily than couplings
  • Accepts nylon and polyurethane tube fittings
  • Made of acetal copolymer plastic for low moisture absorption and high tensile and flexural strength
  • Working pressure of up to 150 psi
  • Meets NSF/ANSI standards 14, 51, and 61 for quality assurance
Best Choice No. 10
Tailonz Pneumatic 1/4 Inch OD Copper Nickel Plating Straight Union Connect air Fittings Quick Connect Push Lock Fittings Pneumatic Fittings Tube connectors PU-1/4 (Pack of 10)
  • 【Product Name】 Straight Tube Fittings Push Lock
  • 【Material】Copper nickel plating
  • 【Size】1/4″ Tube OD x 1/4″ Tube OD
  • 【Maximum Pressure】290Psi【Working Temperature】32~140°F
  • 【Applicable Tube】PU / PA / PE / PVC.

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