Pella screen door outside plastic handle. Note in photo where it broke just above the Phillips screw.

Thanks for posting! The plastic handle you are searching for is the 83-119 Pella Screen Protector. While I am confident this is what you need it would be a good idea to look over the dimensions to confirm.

This is used along with the 83-115 Pella Latch. 

Alternate image for 83-119