Self locking connection of spiral and coupling: with increased stress on the spiral, the torque pressure on the spiral end is increased and is transferred with 100% surface coverage onto the coupling
Safety ring made out of flexible and self-binding material: with increased stress the ring will not slide, rather because of the 100% surface pressure, it adjusts itself to positively lock onto the coupling
Optimum force transmission for professional pipe cleaning
Increased safety
Increased durability/service life of the spiral