Only for the group heads where the is held in with a screw, this part is 58.5 mm O.D. x 7.5 mm tall. The hole for the screw measures 6.5 mm. Manufactured with CW510L (OT57)
low lead content brass.
Also suitable for some models of Cimi, Profitec and Rocket.
ECM part #: C529900550.