Staro threaded ES is a very heavy black painted steel pipe made of rolled mild steel with stove enamel, in 3 m bars, with a color similar to RAL9005 (jet black), with a thread on both sides and a socket screwed on one side (SM-E). This steel pipe is used for extreme mechanical requirements and fixed connections. The advantages are the very high pressure resistance, temperature resistance and corrosion protection. This product is suitable for laying cables with functional integrity (E30/ E60/ E90) and has been tested in the system.0605 DIN EN 61386-21 Classification: 55561 Minimum compressive strength: 4000N/5cm