Brass Compression Fittings


  • Economical

  • UL Listed

  • Thermoplastic / Soft Metal Tubing

No flaring, soldering or other preparation of tubing necessary to assemble. This economical fitting is readily available in a broad selection of styles. Manufactured from CA 360, CA 345 or CA 377 brass.

Listed with Underwriter’s Laboratories for flammable liquid. Compression fittings meet functional requirements of SAE J-512.

Use with annealed copper, aluminum, and Parflex thermoplastic tubing. Not recommended for steel tubing. Manufactured for low and medium pressure tubing connection work where excessive vibration or tube movement is not involved.

Temperature Ranges
From -65° to +250°F with soft metal tubing. For thermoplastic tubing, see manufacturers recommendation for tubing temperature range.

Fair resistance to vibration or tube movement, depending on applications involved. Use long nut for additional resistance to vibration.


  • Captive Sleeve

  • Two piece

  • Pre-assembled

No flaring, soldering or other preparation of tubing is necessary. Preassembled fitting, with captive sleeve. Sleeve is always oriented for correct installation, visible for inspection before and after installation. Heavy-duty fitting aligns to seal even out-of-round tubing. More quickly assembled than either flare or standard tapered sleeve compression fittings. Compress-Align bodies are interchangeable with standard compression fitting bodies. This economical fitting is available in straights, tees and elbows 1/8 in. O.D. through 1 in. O.D. tube size. Manufactured from CA 360, CA 345 or CA 377 brass.

Use with annealed copper, brass, aluminum and thermoplastic tubing. Manufactured for low and medium pressure tubing connections.

Remake Instructions
Tighten to original make-up position plus 1/16 turn to reseat sleeve. Approximately 8 remakes are possible using this reassembly method.

Parker Metru-Lok™

  • Captive Sleeve

  • Metric Tubing

  • NPT, BSPT, BSPP, Metric Threads

Metru-Lok™ is a one-piece, ready-to-use, bite-type fitting for use with either copper or plastic tubing. The ferrule is held captive in the nut. The fitting is designed to permit tube entry and fitting makeup without removal of the nut and ferrule, avoiding the assembly of the fitting components prior to use.

Fitting ready to use
  • Compact fully assembled fitting, timesaving at makeup.
  • Captive snap in ferrule.
  • Simplified handling and stock-keeping.
  • No presetting of the ferrule necessary.

Positive sealing and bite
  • The wedging action of the nut when tightened causes the ferrule to bite into the outside diameter of the tube wall for a leakproof connection.
  • With flexible tubing (polyurethane, PEBA or polyethylene), it is recommended to use a tube insert for a positive holding of the tube.

Visible ferrule (extending to rear of nut) allows quality control checks for correct assembly.


  • Built-in Tube Support

  • Captive Sleeve

  • Knurled Nut

A compact brass compression fitting designed to speed any installation. Body, nut and sleeve are furnished pre-assembled, ready for installation. An exclusive acetal copolymer sleeve holds plastic tubing where it belongs, even when the system pressure exceeds the tubing burst point. Poly-Tite sleeves have superior resilience to resist creeping and stress caused from compression. The black acetal copolymer sleeve also resists ultra-violet ray attack and has excellent dimensional stability. Poly-Tite nuts will rotate around the sleeve as it tightens to prevent twisting and weakening of the plastic tubing. Poly-Tite fittings can be assembled and disassembled repeatedly.

Bodies and Nuts: CA 377, CA 360, CA 345, 316 Stainless Steel
Plastic Sleeves: Acetal Copolymer.
O-rings: Buna N on chrome plated couplings
Viton on stainless steel couplings

Use with Parker Parflex® or other high-quality thermoplastic tubing for pneumatic instrumentation circuits, lubricant and coolant lines, and applications with other gases and liquids. For use with soft metal tubing and nylon thermoplastic tubing, use brass sleeve and nut assembly 61PB.


  • Two Piece Design

  • Easy Assembly

  • Higher Pressure Rating

No flaring, soldering or other preparation of tubing is necessary. Pre-assembled brass fitting, with sleeve machined onto nut. This two piece flareless compression design is available in a broad selection of configurations from 1/8" through 5/8" OD. tube size.

Use with copper, brass, seamless steel and thermoplastic tubing for instrumentation systems, farm and mobile construction equipment, hydraulic and pneumatic controls, process control systems and laboratory equipment.

Steel tubing must be cold drawn and annealed seamless low-carbon steel tubing per SAE J524 with a maximum hardness of Rockwell B 65. Brass insert 63PT is recommended for use with thermoplastic tubing.


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