QZK fittings for blue corrugated pipes - they are designed for installation in places with low mechanical load. Universal products offered by us are made of high quality materials. That is why they are resistant to compression and cracking. Furthermore, QZK black connectors for blue corrugated pipes are available in our range of many different sizes, with diameters ranging from 40 mm up to 110 mm. Please contact us and place your order via Elektroplast.