Andersen® 100 Series gliding patio doors feature different pieces of weatherstrip. These pieces are the interlock weatherstrip (located where the two patio door panels meet), two foam plugs (located at the top and bottom of the interlock weatherstrip), and the pile weatherstrip, which is applied to all four (4) sides of the patio door unit's frame.
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Replacement Parts
Interlock Weatherstrip
The interlock weatherstrip runs vertically on the patio door panels where the stationary and operating patio door panels meet. There is a piece of interlock weatherstrip located on the stationary door panel and the operating door panel. The Interlock weatherstrip consists of a piece on the operating patio door panel and a piece on the stationary door panel. There is also a fuzzy weatherstrip applied to the interlock weatherstrip that can be replaced individually.

Interlock Weatherstrip 
Foam Plugs
The interlock weatherstrip is designed to work with two foam plugs applied above and below it. One foam plug is applied to the head jamb and the other to the sill. 100 Series gliding patio doors use two (2) plugs, one (1) at the top of the interlock weatherstrip and one (1) at the bottom.

Foam Plugs 
Frame Pile Weatherstrip
The frame pile weatherstrip is applied to all four (4) sides of the patio door unit frame and has a gray, fuzzy appearance.
Installation
Instructions to replace the interlock weatherstrip and plugs are under step 14 in Patio Door Panel Replacement Guide (9020082)
.
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