M-d Building Products 43303 Door Jamb Weatherstrip Seal

Product Description

The M-D BUILDING PRODUCTS 43303 is a cinch-style door jamb seal designed to create an airtight barrier along the top and sides of standard entry doors. The assembly combines an aluminum extrusion with a vinyl insert, bonded to the door jamb using 3M adhesive — no drilling or screw holes required. Each kit includes five pieces at 42 inches each and one vinyl connector, providing enough material to seal one complete door opening. The flat metal surface finish gives a clean, finished appearance after installation. This seal blocks air infiltration, dust, water intrusion, and insect entry year-round.

This product is suited for residential entry doors where the existing jamb has pre-cut slots for drop-in seal replacement or where an adhesive-applied solution is preferred over fastener-based weatherstripping. It is commonly installed on exterior hinged doors in both new construction and retrofit applications. The 42-inch piece length accommodates standard door height jambs, and the included vinyl connector joins sections for a continuous seal. General contractors, finish carpenters, and skilled handymen routinely handle this installation type.

Key Features

• Aluminum body with vinyl insert provides durable compression seal against air, dust, water, and insects
• 3M adhesive backing eliminates need for screws or drilling into the jamb
• Kit includes five 42-inch pieces and one vinyl connector — covers one standard door
• Compatible with slotted door jambs for drop-in installation
• Flat silver metal surface finish blends with standard door hardware finishes
• Measure, trim, peel, and stick installation process requires no special tools

Compatibility

Designed as a replacement or new-install door jamb seal for standard residential entry doors with slotted jambs. Fits door openings where top and side jamb weatherstripping is required.

Installation Notes

Installation does not require power tools, but a sharp utility knife or tin snips should be used to trim pieces to final length for accurate fitment. Clean and dry the jamb surface thoroughly before applying the adhesive backing to ensure proper bond strength. No power shutoffs are required for this product type. Follow the door manufacturer and local building envelope guidelines for weatherstripping placement on fire-rated or exterior door assemblies.

Technical Specifications

• Piece Length: 42 inches
• Pieces per Kit: 5 aluminum pieces plus 1 vinyl connector
• Material: Aluminum with vinyl insert
• Finish: Silver flat metal
• Adhesive: 3M adhesive backing
• Weight: 1.667 pounds
• UPC: 00043374433036

Standard Information

• Brand: M-D BUILDING PRODUCTS
• Manufacturer Part Number: 43303