AND MIDDLEBUBBLE AERATORS FOR INSTALLING
ON FIXED AIR DISTRIBUTION SYSTEM
part of the aerator is a hollow pipe on which one fine bubble diaphragm,
type A-109 R1 (middle bubble type A-109 R1S) or two diaphragms fine bubble
type A-109 R2 (middle bubble type A-109 R2S) are connected in a way they
can be disassembled any time.