iRobot Roomba 780 Vacuum Cleaner front wheel caster assembly replacement iRobot 83401 - for use with 500， 600 and 700 series vaccum cleaners<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Replacement for iRobot 83401</li><li>Front Wheel caster Assembly</li><li>for use with 500， 600 and 700 series vaccum cleaners</li><li>Fully Compatible</li><li>no tools required， just snap on</li></ul></div><img src="http://ecx.images-amazon.com/images/I/21z%2BI93DXCL.jpg" noproxy>