Prices, Promotions, styles, and availability may vary. Our local stores do not honor online pricing. Prices and availability of products and services are subject to change without notice. Errors will be corrected where discovered, and Lowe's reserves the right to revoke any stated offer and to correct any errors, inaccuracies or omissions including after an order has been submitted.

BetterBilt 72-in Aluminum Window Joining Kit with Mull Bar

Get Pricing & Availability

  • Aluminum mull kit is used to join windows together.

  • Windows are available in white, bronze, driftwood or mill finish.

  • Mullion is designed to join fin or finless windows.

Best Price. Guaranteed
Find a lower price on an exact item? We'll match it. Some exclusions apply.
Learn More
FREE Returns
Return it in store or ship it back for free. Eligibility rules apply.
Learn More
FREE Shipping
Delivery is on us for orders over $45. Some exclusions apply.
Learn More