A baffle assembly fastening system and mounting frame assembly that can be installed and secured without the use of tools. A baffle assembly frame defining an opening to receive a fixture and having an exposed first surface. A fastener is rotationally coupled to the baffle frame. The fastener extends from the exposed first surface to secure the baffle assembly to a recessed mounting frame, wherein the fastener can be manually rotated from a disengaged position to an engaged position in less ring is coupled to the baffle assembly and has a plurality of aligning posts that serve to align the baffle assembly as it is inserted into a recessed mounting frame.

 
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< Piston engine comprising a pulsation-reducing device

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