Jims, compression release valve game for Harley Davidson

Mechanical Compression Liberation Valves of 10 x 1.0 mm, for most of the ass. 
Press the button and the pressure will get out of the valve. 
When the engine starts, the valves close automatically. 
Designed for high compression engines with difficult start. 
Note: The MCS 978425 threaded tool (10 x 1.0 mm) and the 978424 drill set tool are available separately to facilitate the installation on Twin Cams.
It is sold in pairs
OEM replaces: 32076-04, 29298-02
Manufactured in the US.

Compatible with:> All models B.t., XL and Buell XB