Possibility of varying the distance of the “valve pitch” rubber valves.
Fitting of valves in thickness or using valve-retention outer rings.

Serie Normale | Serie Rinforzata | |||||||||
Diam.EXT | mm | 34 | 38 | 40 | 48 | 48 | 60 | 38 | 40 | 48 |
Diam.INT | mm | 27 | 32 | 34 | 42 | 40 | 52 | 27 | 31 | 34 |