TinnerFlow
Snap-Lock Branch Duct · Straight Runs & Assembly

Snap-lock pipe vertical drop

Short vertical drop

ConnectionSlip-fit joints
SupportUpper hanger plus lower restraint/support

Before you start

  • Confirm drop length, terminal weight, upper support, lower restraint, and any required riser-support detail.
  • Inspect the pipe locks and connection ends.
  • Establish a controlled area below the work.
  • Stage the pipe, fittings, fasteners, sealant, level, upper hanger, lower restraint, and lifting method.

Tools and materials

Snap-lock pipe, approved fittings, fasteners, sealant, plumb reference, upper hanger, lower restraint or terminal support, lift or controlled hand support, and hand tools.

Lay it out

  1. Mark the drop centerline from the upper branch to the terminal.
  2. Measure from finished connection points, including insertion depth.
  3. Plan seam orientation and lower-connection access.

Set and support it

  1. Support the upper horizontal branch independently.
  2. Restrain the drop so it cannot slide, rotate, or fall.
  3. Provide lower support where the length or device weight requires it.

Make the connection

  1. 1

    Snap and inspect the longitudinal seam on the floor.

  2. 2

    Connect the upper end while the drop is restrained.

  3. 3

    Plumb the drop from more than one direction.

  4. 4

    Fasten and seal the upper connection.

  5. 5

    Connect the lower terminal without hanging its weight from one joint.

  6. 6

    Install lower restraint or device support.

  7. 7

    Release temporary support slowly and watch for movement.

Check the install

  • The drop is plumb and not twisted.
  • Joints are fully seated and cannot pull apart.
  • The terminal has independent support.
  • The longitudinal seam is fully closed.
  • The assembly remains stable after release.

Common mistakes

  • Letting the lower device hang from the upper joint.
  • Measuring before terminal elevation is final.
  • Allowing the loose drop to swing.
  • Leaving a long drop without required restraint.

Stop and ask

Stop for a long unsupported drop, uncertain device load, missing restraint detail, unsafe handling, or any condition where the pipe could separate or fall.