O.S. Engines 27757100 Cover Plate .61 FX This is a Cover Plate for the O.S. Max .61FX engine. The cover plate w/needle valve holder is a one-piece aluminum construction. Includes: e (1) O.S. Max .61FX Aluminum Cover Plate. Part number(s) included (in factory packaging): 27757100 A highly-detailed and accurate reproduction Durable made of high quality materials