Why Kessler?
01
Decades of experience in plant engineering
For over 50 years, we have been developing and manufacturing sight glass fittings for industrial applications—from chemicals to food processing.
02
Precision “Made in Germany”
Our products are manufactured, tested, and documented in Germany. This is how we guarantee maximum dimensional accuracy, quality, and durability.
03
Tailor-made special solutions
In addition to standard fittings, we also produce custom-made items based on drawings, specifications, or industry-specific requirements – precisely tailored to your system.
04
Reliable under pressure and temperature
Our sight glasses are designed for the most demanding operating conditions – with tested leak-tightness and materials that perform reliably even at extreme temperatures and with aggressive media.
05
Compatibility with common standards and norms
All fittings comply with the relevant standards such as DIN 28120, EN 1092-1, and the Pressure Equipment Directive (PED).
06
Fast availability and short delivery times
Many standard versions are available from stock. We produce custom orders on time — even for projects with tight deadlines.
What applications are your sight glass fittings suitable for?
Our sight glasses are used in a wide variety of industrial plants, including the chemical, pharmaceutical, food processing, process engineering, and plant construction sectors. They are used for visual monitoring of fill levels, flow, reactions, and processes in pipelines and vessels.
