3M SSBT23 Fixed Length Breathing Tube for PF600 80 cm

PU medium hose 80 cm. for combination with FH1, FH2, FH21, FH22, FH51, FH3, FH31, FH5. The coupling between Proflow and medium hose has been switched from 40 mm. to bayonet thread. Therefore, new middle hoses are introduced to Proflow. If you want to retain 40 mm. threads, bayonet threads can be removed with special screwdriver. The old medium hoses for 40 mm. threads appear under "Medium hoses AF/PF". The standard hoses are the fixed PU medium hoses, while flex pu is a soft and more flexible "accordion" hose. 

NOTE! Flex middle hoses are so far procured goods.