Description
Replacement PTFE spindle 12 mm is a precision spare component for laboratory stopcock and flow-control assemblies. It features a 12 mm bore and is supplied together with a safety screw, enabling secure seating and reliable sealing during fluid handling. The spindle is made of PTFE, giving an inert contact surface suited to chemically demanding laboratory environments. Intended as a direct replacement for the Witaflo red series from manufacturer Witeg, it restores smooth operation when the original spindle becomes worn. Supplied as a single piece with a net weight of 0,064 kg, the part supports routine maintenance of glassware and apparatus used in analytical and preparative work. PTFE construction helps minimise contamination risk during transfer of aggressive media while preserving consistent flow characteristics. Laboratory staff can exchange the spindle without replacing the entire valve assembly, keeping existing Witaflo red fittings in service. The defined bore geometry matches the original specification for straightforward installation during servicing of laboratory taps and stopcocks.
This article is part of Viscometers, in Density & viscosity measurement.
Key features
- Pack size: 1 pc
- Product type: Replacement PTFE spindle
- Bore diameter: 12 mm
- Material: PTFE
- Compatible with: Witaflo red
- Includes: Safety screw
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Questions about Spare PTFE-needle valve 12 mm
What is this article?
Spare PTFE-needle valve 12 mm is the article on this page. Luminix Health distributes Witeg for laboratory use. It sits in Viscometers, inside Density & viscosity measurement, in Lab instruments.
A capillary viscometer times the flow of a liquid through a tube. A rotational viscometer twists a spindle in the liquid. Both need a stated temperature. Kinematic and dynamic viscosity are different numbers. The capillary size has to put the flow time in the range the method allows.
Density is mass divided by volume. A hydrometer floats at a depth that depends on the density of the liquid. A pycnometer is a vessel of known volume that is weighed full. Viscosity is the resistance to flow. A capillary viscometer times how long a volume takes to fall through a tube. Both measurements need a stated temperature, because liquids change density and viscosity as they warm. The units trace to the BIPM and to NIST.
Which category should I open next?
The category is Density & viscosity measurement. The sub-category is Viscometers. The catalogue is Lab instruments.
Shelves beside this one are Hydrometers and Density meters & pycnometers.
What should I check before I order?
When this page shows a safety data sheet, use that manufacturer file. Hazard text does not belong in the sales description. For a pack size, a grade or a certificate that is not on the page, send a quote request or contact the team.
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The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.