Oilmiser sampling tubes have a much larger 0.25in inside diameter pitot tube that significantly reduces the time and effort required to draw an oil sample using a handheld vacuum pump.

Oil sampling tube and valve assemblies fall into two general classifications: low-viscosity assemblies used for lighter lubricating oils up to ISO VG150; and high-viscosity high-flow assemblies used for heavier gear oils from ISO VG220 and up. Most low-viscosity sampling tubes use a 0.25in OD steel or stainless steel pitot tube, mechanically fixed into a standard Minimess sampling valve. This ridged 'all in one' design has a 0.25in NPT (male) pipe thread.

When the gearbox access port is larger than 0.25in NPT, additional pipe bushings are required.

Common lengths for sampling tubes are 12, 18 and 24in.

Longer lengths can be custom made to specification.

On high-viscosity applications using heavier gear oils above ISO VG150, the Minimess sampling valve is replaced with a 'high-viscosity high-flow' sampling valve.

The length of the 0.25in OD pitot tube remains the main resistive element to drawing an oil sample with a vacuum pump.

Oilmiser sampling tubes have a much larger 0.25in inside diameter pitot tube.

This feature lowers the flow resistance to heavier gear oils and significantly reduces the time and effort required to draw an oil sample using a handheld vacuum pump.

Standard tube lengths are 12 and 24in; however, thanks to the exclusive Oilmiser three-piece design, any length of sampling tube can be accommodated on the job.