Write down the model number of your mower on a piece of paper. The data plate with this information is on the top side of the mower deck, behind the engine. There will be a model number and a serial number; write down both.
Find an authorized Honda Power Equipment dealer. The simplest way is to use Honda's online resource. Follow the Dealer Locator's instructions to narrow your search for the type of equipment you need.
Contact a dealer about a mulching plug for your HRA214 mower. Be sure you have the model number and serial number for your mower to ensure that you get the correct part.