Introduced in 1928, it remained in the Stuart range until 1990 - there is further information about this unusual design on the Stuart website here.
| length/inches | 9 |
| width/inches | 8 |
| height/inches | 4 |
| weight/kg | 2 |
| bore x stroke/inches | 3/4 x 3/4 |
| cylinder material | cast iron |
| valve type | piston |