![four panel sliding door that is open in the middle](https://images.contentstack.io/v3/assets/bltf589e66bcaecd79c/blt39926d2f5b133a5f/6002138494a1800f61b4d9c0/sliding-door-pocket-replacement-hero.jpg?width=1439&height=700&format=jpg&quality=90)
Sliding Patio Door Assemblies & Accessories
From knock-down frame assemblies to mullions and trim, explore installation assemblies and accessories designed to help make life easier.
Select Assemblies & Accessories
Mullion Installation Instructions
Pella® Impervia®
Select a mullion assembly/combination instruction from the list below.
Helpful Resources
- Pella Contractor Program
Pella Contractor Program
- Support Center
Support Center
- Installation Guides
Installation Guides
- Product Warranties
Product Warranties