Bosch 27mm vs Bosch Gcm12: specs compared
Updated 05 September 2026.
32 mm
Bosch Gcm12 wins on mating diameter
On mating diameter, Bosch Gcm12 leads: 32 mm versus 27 mm.
| Spec | Bosch 27mm | Bosch Gcm12 |
|---|---|---|
| Port type | male spigot (hose goes over it) | female socket (hose goes into it) |
| Outer diameter (OD) | 1-1/16 in, 27 mm | |
| Manufacturer designation | 27 mm OD | rear approx 1-1/4 in ID (32 mm) |
| Mating diameter (mm) | 27 | 32 |
| Inner diameter (ID) | 1-1/4 in, 32 mm |
Questions and answers
Which has the higher mating diameter, Bosch 27mm or Bosch Gcm12?
On mating diameter, Bosch Gcm12 leads: 32 mm versus 27 mm.
How do Bosch 27mm and Bosch Gcm12 compare?
On mating diameter, Bosch Gcm12 leads: 32 mm versus 27 mm.