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Parker CPI™/A-LOK® Instrumentation Tube Fittings are designed as leak-free connections for process, power and instrumentation applications. The CPI tube fittings utilize a single ferrule for easy make-up and excellent performance in vibration applications. The “spring loaded” effect of the single ferrule creates a constant tension between the fitting body and fitting nut. The A-LOK two ferrule compression tube fittings are designed to provide reliable leak-free connections for applications that specify a two ferrule system. These single and two ferrule fitting designs are manufactured to the highest quality standards and are available in a broad range of sizes, materials and configurations.

NOTE:
  • Dimensions for reference only, subject to change.
  • A and C dimensions are typical finger-tight.
    • NPT Male Run Tee for fractional tube
    Unit of Measure
    1 2 

    Item #

    Connection Type

    NPT Pipe Thread

    A

    C

    H

    L

    R

    W HEX

    2-2-2 RBZ N/A CPI™ x NPT x CPI™ N/A 1/8 N/A 1.63 in N/A .93 in N/A .70 in N/A .66 in N/A .38 in N/A 7/16 in
    2-4-2 RBZ N/A CPI™ x NPT x CPI™ N/A 1/4 N/A 1.89 in N/A .96 in N/A .93 in N/A .70 in N/A .56 in N/A 9/16 in
    3-2-3 RBZ N/A CPI™ x NPT x CPI™ N/A 1/8 N/A 1.66 in N/A .96 in N/A .70 in N/A .70 in N/A .38 in N/A 7/16 in
    4-2-4 RBZ N/A CPI™ x NPT x CPI™ N/A 1/8 N/A 1.80 in N/A 1.06 in N/A .74 in N/A .77 in N/A .38 in N/A 1/2 in
    4-4-4 RBZ N/A CPI™ x NPT x CPI™ N/A 1/4 N/A 1.99 in N/A 1.06 in N/A .93 in N/A .77 in N/A .56 in N/A 1/2 in
    5-2-5 RBZ N/A CPI™ x NPT x CPI™ N/A 1/8 N/A 1.99 in N/A 1.17 in N/A .82 in N/A .88 in N/A .38 in N/A 5/8 in
    5-4-5 RBZ N/A CPI™ x NPT x CPI™ N/A 1/4 N/A 2.18 in N/A 1.17 in N/A 1.01 in N/A .88 in N/A .56 in N/A 5/8 in
    6-4-6 RBZ N/A CPI™ x NPT x CPI™ N/A 1/4 N/A 2.21 in N/A 1.20 in N/A 1.01 in N/A .91 in N/A .56 in N/A 5/8 in
    6-6-6 RBZ N/A CPI™ x NPT x CPI™ N/A 3/8 N/A 2.43 in N/A 1.31 in N/A 1.12 in N/A 1.02 in N/A .56 in N/A 13/16 in
    8-6-8 RBZ N/A CPI™ x NPT x CPI™ N/A 3/8 N/A 2.54 in N/A 1.42 in N/A 1.12 in N/A 1.02 in N/A .56 in N/A 13/16 in
    8-8-8 RBZ N/A CPI™ x NPT x CPI™ N/A 1/2 N/A 2.73 in N/A 1.42 in N/A 1.31 in N/A 1.02 in N/A .76 in N/A 7/8 in
    10-8-10 RBZ N/A CPI™ x NPT x CPI™ N/A 1/2 N/A 2.89 in N/A 1.50 in N/A 1.39 in N/A 1.10 in N/A .76 in N/A 15/16 in
    12-12-12 RBZ N/A CPI™ x NPT x CPI™ N/A 3/4 N/A 3.03 in N/A 1.57 in N/A 1.46 in N/A 1.17 in N/A .75 in N/A 1 1/16 in
    14-12-14 RBZ N/A CPI™ x NPT x CPI™ N/A 3/4 N/A 3.41 in N/A 1.76 in N/A 1.65 in N/A 1.36 in N/A .75 in N/A 1 3/8 in
    16-12-16 RBZ N/A CPI™ x NPT x CPI™ N/A 3/4 N/A 3.59 in N/A 1.94 in N/A 1.65 in N/A 1.45 in N/A .75 in N/A 1 3/8 in
    16-16-16 RBZ N/A CPI™ x NPT x CPI™ N/A 1 N/A 3.78 in N/A 1.94 in N/A 1.84 in N/A 1.45 in N/A .94 in N/A 1 3/8 in
    2MRT2N N/A A-LOK® x NPT x A-LOK® N/A 1/8 N/A 1.63 in N/A .93 in N/A .70 in N/A .66 in N/A .38 in N/A 7/16 in
    2MRT4N N/A A-LOK® x NPT x A-LOK® N/A 1/4 N/A 1.89 in N/A .96 in N/A .93 in N/A .70 in N/A .56 in N/A 9/16 in
    3MRT2N N/A A-LOK® x NPT x A-LOK® N/A 1/8 N/A 1.66 in N/A .96 in N/A .70 in N/A .70 in N/A .38 in N/A 7/16 in
    4MRT2N N/A A-LOK® x NPT x A-LOK® N/A 1/8 N/A 1.80 in N/A 1.06 in N/A .74 in N/A .77 in N/A .38 in N/A 1/2 in
    4MRT4N N/A A-LOK® x NPT x A-LOK® N/A 1/4 N/A 1.99 in N/A 1.06 in N/A .93 in N/A .77 in N/A .56 in N/A 1/2 in
    5MRT2N N/A A-LOK® x NPT x A-LOK® N/A 1/8 N/A 1.99 in N/A 1.17 in N/A .82 in N/A .88 in N/A .38 in N/A 5/8 in
    5MRT4N N/A A-LOK® x NPT x A-LOK® N/A 1/4 N/A 2.18 in N/A 1.17 in N/A 1.01 in N/A .88 in N/A .56 in N/A 5/8 in
    6MRT4N N/A A-LOK® x NPT x A-LOK® N/A 1/4 N/A 2.21 in N/A 1.20 in N/A 1.01 in N/A .91 in N/A .56 in N/A 5/8 in
    6MRT6N N/A A-LOK® x NPT x A-LOK® N/A 3/8 N/A 2.43 in N/A 1.31 in N/A 1.12 in N/A 1.02 in N/A .56 in N/A 13/16 in
    Unit of Measure
    1 2