VIROTEC®-telescope pipe length tailor-made

The VIROTEC®-telescope pipe VS is an adjustable drop nipple for use in fire sprinkler systems. It enables precise adjustment of the sprinkler heads to the location of a suspended ceiling in a vertical direction. The initial length can be adjusted to the installed position by shortening the outer pipe. The length can be adjusted after the system has been installed and in service. Installation time is considerably reduced.

Mounting instruction
  1. Determine the installed length.
  2. Seal the thread and fit the component.
  3. Adjust length, adjustment made by screwing (also possible under pressure).
    Important: The adjusting pipe may only be screwed in up to the start of the outer pipe!

The VIROTEC®-telescope pipe VS is made up of the following components:
  • Item 1 Outer pipe (CED-coated, black)
  • Item 2 Adjusting pipe (CED-coated, black)
  • Item 3 O-ring (silicon)

All models are ready to install with outer 1” and ½ inner thread. The length is adjusted by screwing the adjusting pipe and outer pipe together. This is also possible under pressure. The seal seals off the gap between the two pipes.


Model Adjustment Connections
Adjustment (inch) Min. length (inch) Max. length (inch) Inlet OT Inlet IT
VS 0.0 2.0 3.5 5.5 1"NPT ½”NPT
VS 0.1 2.4 3.9 6.3 1"NPT ½”NPT
VS 0.2 4.0 5.5 9.5 1"NPT ½”NPT
OT= Outer thread
IT= Inner thread


Technical data   Approvals

Surface CED-coated (black)
Weigth Type 0.0: approx. 0.6 p
  Type 0.1: approx. 0.7 p
  Type 0.2: approx. 1.0 p
Thread: Pipe thread 1”NPT, ½”NPT
  according ASME/ANSI B1.20.1
Working temperature 4 °F to +230 °F
Working pressure 360 PSI (PN 25)