Andersen 100 Series WHT Weep Hole Cover

The Andersen 100 Series WHT Weep Hole Cover (part 9123290) is a 1.75-inch white plastic cap that snaps into drainage holes on Andersen 100 Series windows. This tiny component solves real drainage and air infiltration problems that plague window installations across Montana’s wind-swept valleys.

Contractors dealing with customer complaints about whistling windows and air leaks will find this part particularly valuable — users rate it 5/5 for effectively stopping whistling sounds. The one-way drainage flap design allows water to weep out of the window frame while preventing wind blow-back, addressing both moisture management and air infiltration in a single component.

Technical Specifications and Material Performance

This genuine Andersen part features high-density UV-stabilized plastic construction specifically engineered to withstand Montana’s intense UV exposure at elevation. The precision matters here — generic 1.75” weep covers may have slight dimensional variances that prevent proper snap-fit installation.

Specification	Value
Length	1.75 inches
Color	White (WHT)
Material	High-density UV-stabilized plastic
Design Type	One-way drainage flap / cap
Part Number	9123290
UPC	699699685584

The part comes with Andersen’s 10-Year Limited Warranty on Genuine Parts, backing up the UV-stabilized construction that resists brittleness from Montana’s temperature swings and high-altitude sun exposure.

Installation and Compatibility

The weep hole cover fits Andersen 100 Series Single-Hung, Double-Hung, and Gliding windows exclusively. Installation happens on the exterior nose of the sill, where the cover snaps into pre-cut weep hole slots. For replacements, the old part pries out easily with a flat-blade screwdriver.

Before snapping in the new cover, contractors should ensure the weep hole path is clear of debris or construction tape — a common oversight that defeats the drainage function entirely. The snap-fit installation requires no tools or fasteners once the old cover is removed.

Contractors typically buy these in 10-pack quantities for full-house maintenance projects. While other colors exist (Black, Sandtone, Cocoa Bean), part 9123290 specifically matches Andersen’s white frames.

The Bottom Line

This small part addresses legitimate field problems. In high-wind conditions common across Montana, these covers reduce air infiltration and eliminate whistling noises. The one-way flap keeps wind-driven rain from blowing back through weep holes while maintaining critical drainage function.

The cover also protects window interiors from debris, dust, and insects — practical benefits that reduce callbacks and improve customer satisfaction. For service techs handling 100 Series windows with air infiltration complaints, checking and replacing these weep hole covers should be step one.

Frequently Asked Questions

Q: Will generic weep hole covers work instead of the Andersen part?

Genuine Andersen part 9123290 ensures a precise snap-fit compared to generic 1.75” weep covers which may have slight dimensional variances or color mismatches. The exact fit matters for proper function and aesthetics.

Q: What window types does this cover fit?

This cover specifically fits Andersen 100 Series Single-Hung, Double-Hung, and Gliding windows. It won’t work on other Andersen series or window types.

Q: How do I know if I need new weep hole covers?

If windows whistle in the wind or show signs of air infiltration around the sill area, weep hole covers may be missing or damaged. Users report the covers effectively stop whistling sounds when properly installed.