M-d Building Products 43301 Door Bottom Weatherstrip 36 in

Product Description

The M-D BUILDING PRODUCTS 43301 is a door bottom weatherstrip replacement designed to seal the gap between the door slab and the threshold. The unit combines an aluminum body with a flexible vinyl insert that compresses against the floor surface to block air infiltration, dust, water, and insects. At 36 inches in length, it arrives pre-trimmed for standard 36-inch residential or light-commercial doors. Installation relies on 3M adhesive backing, so no drill, screws, or pilot holes are required. It is suited for building maintenance professionals, door and window installers, and knowledgeable DIYers looking to restore weathertight performance on an existing door without removing the door from its hinges.

This door bottom seal is intended for residential and light-commercial exterior door applications where energy efficiency and weather resistance at the door base have degraded. It is applied directly to the bottom face of the door slab and is designed for smooth, flat door bottoms. The pre-trimmed 36-inch length fits standard single-door openings without additional cutting in most cases. Installers working on narrower doors can trim the strip to the required width using standard tin snips or a utility knife before adhering it in place.

Key Features

• Aluminum body with flexible vinyl insert provides durable compression seal at door base
• Pre-trimmed to 36 inches for standard door width — trim down for narrower openings
• 3M adhesive backing eliminates need for drills, screws, or pilot holes
• Blocks air, dust, water, and insects at the door bottom gap
• Installs in under 5 minutes — measure, trim if needed, peel, and stick
• White finish suits painted interior and exterior door faces

Compatibility

Designed as an adhesive-mount door bottom replacement for standard 36-inch residential and light-commercial door slabs with a smooth, flat bottom surface.

Installation Notes

Installation is performed by building maintenance technicians, carpenters, or door hardware installers. Before applying, clean the door bottom surface thoroughly to remove dirt, grease, and old adhesive residue — the 3M bond requires a clean, dry substrate. If trimming to width, cut with tin snips or a sharp utility knife before removing the adhesive liner. No power tools are required; however, verify the door closes freely after installation to confirm the seal compresses without binding.

Technical Specifications

• Length: 36 inches
• Body Material: Aluminum
• Insert Material: Vinyl
• Finish: White
• Adhesive System: 3M adhesive backing
• Weight: 0.534 pounds
• Unit of Measure: Each

Standard Information

• Brand: M-D BUILDING PRODUCTS
• Manufacturer Part Number: 43301