Reliabilt-window-mull-kit-instructions -

: If your windows have nailing fins or J-channels on the sides being mulled, remove them using pliers or a utility knife to allow the frames to sit tightly together.

: For a visual walkthrough, check out this guide on How to Mull Two Vinyl Windows Together . Window mullion installation #Lowes reliabilt-window-mull-kit-instructions

: You can find series-specific PDFs (e.g., Series 105 or 150) on the ReliaBilt Installation Support page . : If your windows have nailing fins or