The size of a STORZ coupling can be verified by measuring the distance between lugs (measured on the inside). Distance between the lugs: 31 mm, 44 mm, 51 mm, 66 mm, 81 mm, 89 mm, 105 mm, 115 mm, 133 mm, 148 mm, 160 mm, 188 mm, 220 mm, 278 mm.

The most popular sizes:

– size A: lug distance 133 mm,

– size B: lug distance 89 mm,

– size C: lug distance 66 mm,

– size D: lug distance 31 mm.