spotting drills

NWZ NT water pipeline spotting drill for cast iron and AC pipes with replaceable stem

  • Type 1500
  • Working pressure PN16
  • Gate valve ductile iron GJS 500-7
  • Clamp stainless steel
  • Diameters DN80 – DN300
  • Outlets 32mm, 40mm, 50mm
  • Temp. max. 40°C – for water

NWZ water supply spotting drill for cast iron, steel and asbestos cement pipes mainly used in water supply systems to drill under pressure with drilling apparatus and coated with best quality epoxy resin anti-corrosion coatings.


National Hygiene Institute Warsaw.


Threaded connection acc. to PN-EN 228-1.
Requirements and tests according to PN-EN 1074 – 1 and 2


  • Drilling under pressure using a drilling machine.
  • Universal foot design for two diameter ranges DN80-100 and DN150-300.
  • Integrated with a gate valve cat.-no 2655, 2665, 2675. 2655, 2665, 2675.
  • Full, smooth, equal-flow and cavity-free passage.
  • The valve stem sealing may be replaced under full pressure in any position of the wedge.
  • Outlets with threads G 1 1/4″, G 1 1/2″ and G 2″.
  • Can be installed on steel, cast iron and AC pipes.
  • Triple sealing system of the stem: top seal, set of 5 o-rings (4 o-rings inside and outside the screw), bottom seal, lip seal.
  • Gate valve body, bonnet, wedge and foot with internal thread made of ductile cast iron grade EN-GJS 500-7.
  • Foot with internal thread made of ductile cast iron grade EN-GJS 500-7.
  • Stainless steel clamp lined with rubber, forged stainless steel T-bolt with rolled thread.
  • Stainless steel stem with cold rolled thread, without notches in the sealing zone, which allows the use of o-rings in the screw.
  • Wedge suspension nut on the stem – non-replaceable, made of brass, hot-dipped in the wedge of the gate valve.
  • Wedge made of spheroidal cast iron, vulcanized inside and outside with EPDM rubber with hardness of 70±5°Sh.
  • Foot gasket with trapezoidal cross section made of EPDM rubber, other seals made of NBR rubber.
  • Bolts connecting the cover to the body – blind threads, fully protected against corrosion with paraffin-wax compound.
  • Internal and external corrosion protection by epoxy powder paint RAL 5005 with a thickness of min. Epoxy powder paint RAL 5005 with minimum thickness 250μm and 3kV resistance.