Complete cylinder Includes: Piston Ø 34 mm 2 Compression segments Ø 34 x 1.2 mm Piston pin 8x5x22 2 x Circlip 8x0.7 4 x Plastic screw IS-D5x60 STH/90754784268 Models: BG 56 BG 56 C-E BG 56 C-E Z BG 56-Z SH 56 SH 56 C-E SH 56 C-E Z on the left the previous cylinder STH/42410201202 on the right the new cylinder STH/42410201204 The new cylinder with piston Ø 34 mm STH/42410201204 includes the following new components: Piston Ø 34 mm code STH/42410302008 and Compression ring Ø 34 x 1.2 mm STH/42370343001. on the left the previous piston STH/42410302001 on the right the new piston STH/42410302008 The new version 4241 030 2008 is only equipped with a compression ring and the "4144" marking on the piston crown. The older pistons still remain available for the earlier machines. New pistons cannot be fitted to front machines. on the left the previous compression ring STH/41440343000 on the right the new compression ring STH/42370343001 The new Compression ring Ø 34 x 1.2 mm 4237 034 3001 is marked with two green stripes. Previous compression rings still remain available for other construction series. The new rings can also be used on the front machines.