Filter housing with side connection for external intake damper.
Originally mounted on the following engines:
50 / 3LKH, 50/3 / LHX, 50 / 3LFH, 50 / 3MLFB, 50 / 4LKH, 50 / 4LF NL
50 / ADL X, 50 / AE X
Originally mounted on the following carburetor:
1/17/49, 1/17/108, 1/17/172