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Mechanically Attached Fitting ... the weldless, threadless way to join pipe/tube
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Frequently Asked Questions

  • What if the fitting leaks? +

    When installed properly and pressure tested successfully, PYPLOK® fittings will never leak. If a leak is present during pressure testing use the inspection gauge to confirm the fitting has been swaged properly. The next step is to re-swage the fitting using the PYPLOK® tool and re-test. If necessary, the PYPLOK® fitting can be cut out and replaced.

  • Can you re-use a PYPLOK® fitting? +

    PYPLOK® fittings cannot be re-used once they have been installed. PYPLOK® fittings are considered a permanent connection much like a welded joint but installed cold.

  • What if you cannot see the insertion marks on the tube? +

    It is recommend that the fitting be cut out and replaced by following the proper PYPLOK® installation procedures.

  • Are PYPLOK® fittings approved by ASME B31? +

    American Society of Mechanical Engineers (ASME) B31 pressure pipe codes are recognized and generally accepted as good engineering practice for piping design. PYPLOK® fittings fall under ASME code section B31.3 – process piping and section B31.1 – power piping. Fittings that are manufactured in accordance with these specifications and standards may be used in piping systems. Fittings that are not listed in ASME code B31.3 and B31.1 are considered unlisted components and as such the pressure design of these components must meet the requirements set out in section 304.7.2 in B31.3 and 104.7.2 in B31.1.

    PYPLOK® fittings manufactured by Tube-Mac® Piping Technologies, meet the criteria established in ASME B31.3 and ASME B31.1. PYPLOK® fittings have undergone successful service experience, supplement testing, proof testing and detailed stress analysis using finite element methods.

    For further details, please contact This email address is being protected from spambots. You need JavaScript enabled to view it..

  • Is PYPLOK® available in Metric sizes? +

    PYPLOK® is available in complete range of metric sizes and shapes. Sizes range from 6mm through 60mm.

  • What material types is available for PYPLOK®? +

    PYPLOK® is available in Carbon Steel, Stainless Steel type 316, Copper Nickel (CuNi) 70/30, limited selection of fittings in CuNi 90/10, Duplex and Super Duplex. For further details, please contact This email address is being protected from spambots. You need JavaScript enabled to view it..

  • What maximum temperature can the fittings withstand? +

    PYPLOK®'s elastomeric seals (O-Rings) are the limiting factor. Viton is the standard elastomeric seal compound with a maximum temperature of 400º F (205º C). For steam or hot water applications it is highly recommend to use an EPDM seal which has a maximum operating temperature of 400º F (205º C). Other seals are available upon request including cold temperature applications.

  • How close can I install PYPLOK® fittings to a pipe bend? +

    PYPLOK® fittings cannot be installed on the radius of a bend. The fitting must be installed on the straight leg beyond the tangent point of the radius.

  • If I don't swage the fitting enough, do I have to cut it out and replace it? +

    No you don't have to cut it out and replace the fitting. Simply place the PYPLOK® tool around the fitting and re-swage it. Check with the inspection gauge to ensure the proper swage diameter has been achieved. As a pre-engineered tool, you can swage the fitting hundreds of times and you will never damage the fitting. The PYPLOK® tool will automatically stop at a pre-engineered diameter for each size.

  • Can you remove a section of pipe after installation? +

    PYPLOK® fittings are a permanent tamper proof connection that cannot be removed once installed very similar to a welded joint. PYPLOK® does have a variety of separable fittings with Male and Female nuts, SAE Flanged configurations, DIN and ANSI Flange bolted connections. It is up to the designer or installer to use the separable fittings as required.

  • How much space is required for the PYPLOK® tool? +

    The PYPLOK® tool is very versatile. The U-Shaped head assembly can be removed and slipped around the pipe and the power unit can be locked into position at any angle. The pipe spacing between any standard DIN block style pipe clamps provides adequate space for the tooling.

  • Can we use our own hydraulic pump to operate the tool? +

    Any standard 10,000 PSI (690 bar) hydraulic pump may be used provided it is used in conjunction with a high pressure nonconductive hose with quick disconnect couplings that mate with the swivel connection of the PYPLOK® tool. Under no-circumstance should a pump rated above 10,000 PSI (690 bar) ever be used to operate a PYPLOK® tool.

  • Do you have to remove the lacquer on carbon steel black pipe? +

    Yes, lacquer, paint and other coatings must be removed along the swage area of the pipe. PYPLOK® fittings must be swaged on bare metal of the pipe or tube. For more details, please refer to the PYPLOK® Installation Manual - pyplok.com/en/technical-data/installation-manual.


  • Do you have to remove zinc galvanizing on carbon steel pipe and/or tube? +

    No you do not, however you must remove hot dipped galvanizing along the swage area.

  • Can there be a gap between the ends of the pipe? +

    It is not necessary for the pipe ends to touch one another. It is highly critical to mark the insertion depth on the tube in order to verify the proper installation.

  • Is there one PYPLOK® tool that can swage the entire range of fittings? +

    PYPLOK® offers a range of installation tools to suit the customer's requirements depending on the sizes being installed.

  • Does PYPLOK® fitting need to be x-rayed after installation? +

    PYPLOK® fittings do not need to be x-rayed after installation. A visual inspection of the insertion marks must be done along with the use of the inspection gauge which must fit around the swaged fitting. For more details, please refer to the PYPLOK® Installation Manual - pyplok.com/en/technical-data/installation-manual.

  • Does the piping system need to be hydrostatically tested at 1.5 times the design pressure? +

    Final testing is up to the individual test requirements. ASME B31.1 and B31.3 standards are located in chapter VI. May include but not limited to hydrostatic test, visual test, and or a gas leak test. A hydrostatic test can be done with water, mineral oils or other specified fluids. In hydraulic oil systems it is not advisable to test with water. It is advisable to use the system hydraulic oil as the test medium and leave it in the system upon oil flushing & testing.

  • Can be PYPLOK® be installed in hazardous areas? +

    PYPLOK® can be easy installed in hazardous areas by using an ATEX approved manual hydraulic pump or pneumatic hydraulic pump.

  • Can I use a disc grinder to prepare the swage area? +

    Never use a disc grinder or any other grinder to prepare the swage area on the pipe. The use of such grinders may leave flat spots on the pipe. A more acceptable solution is to use emery cloth or a flapper wheel type of tool. Never clean the pipe in a longitudinally motion as it will cause leak paths. Always clean the pipe radially around the pipe. For more details, please refer to the PYPLOK® Installation Manual - pyplok.com/en/technical-data/installation-manual.

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