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AP Valves Pony Cylinder Cambands -Sizing Information

BK18 - 4"/102mm diam Pony to a 7"/178mm diam main cylinder
BK19 - 4"/102mm diam Pony to a 8"/203mm diam main cylinder
BK20 - 4.5"/114mm diam Pony to a 7"/178mm diam main cylinder
BK21 - 4.5"/114mm diam Pony to a 8"/203mm diam main cylinder

It is advisable you measure your cylinders but typically:  

10 and 12 litre cylinders = 7" diam
12 litre dumpy and 15 litre cylinders = 8" diam
3 litre steel cylinders = 4" diam 
3 litre aluminium cylinders = 4.5" diam 
2 litre steel cylinders = 4" diam 
2 litre aluminium cylinders = 4.5" diam 
1.5 litre aluminium cylinders = 4.5" diam