Hi klcoop22367...
The cap that you speak of is probably a thermostat,thermal fuse,clyclic fuse,etc.
It will go on your vent portion of the dryer, take the wires and leave them attached to the thermostat and move it all around the back of the dryer, it will fit somewhere in that locations for which the wire is long enough to reach and no others.
To see an exploded view of your dryer and parts go to the following webpage.
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Parts and exploded view link:
http://www.partselect.com/MultiModels.aspx?ModelNum=pye2300ay&searchTerm=&RefineSearch=0
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