Can I use the mulching plug instead of the grass box?
Yes — if you are making a light cut and wish for the grass cuttings to remain on the lawn, fit the mulching plug and close the top flap to cover the discharge opening. It is not necessary to fit the grass box in this case. (Page 7)
From the official Ryobi Rlm13e33s 1300w Electric 33cm Lawnmower manual, page 7
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