• Hose sockets pushed into each other are pre-centred by the seal. The coupling laid over the ends of the couplings can be closed by a person without any centring aid or additional personnel.
• The mounting of the seal has been simplified because the seal ring no longer has to be pushed over the welding ring. It is already on the male part of the PM-ULTRAFLEX system.
• As the seal has been simplified, cleaning after pump operation is also considerably easier. Concrete residue can easily be simply wiped away by hand and no longer has to be scratched away out of the seal.
• The 65 mm ( SK couplings previously used can continue to be used without problems. With the PM-ULTRAFLEX system, they are compatible for both the 65 mm and the 75 mm line.

Putzmeister has of course applied for a patent for the new coupling system. The name PM-ULTRAFLEX is also a protected trade mark.