M-D 5520 Gray Vinyl Threshold Insert Low Profile 36x0.375 in 5-Pack The M-D 5520 Gray Vinyl Threshold Insert is a durable, low-profile seal designed to restore weather-tight performance to doors with shallow bottom channels. Made from resilient vinyl, it creates an effective barrier against drafts, moisture, dust, and insects?helping improve indoor comfort and reduce energy loss. Measuring 36 inches long and 3/8 inch wide, it fits standard low-threshold door bottoms and can be easily trimmed with scissors for a custom fit. No adhesive or tools are required; simply slide it into the existing door groove for a quick, tool-free replacement that enhances efficiency and protection year-round. Features - High-quality vinyl construction resists cracking, moisture, and everyday wear - Creates a tight seal against drafts, dust, insects, and light moisture intrusion - Low-profile 3/8-inch width fits shallow door bottom channels on interior and exterior doors - Easily cut to length with household scissors for precise, custom sizing - No adhesive or fasteners needed?slips directly into existing door threshold groove - Gray color blends discreetly with most door and threshold finishes - Improves home energy efficiency by reducing air leakage at door bottoms - Ideal for residential and light commercial applications with low-clearance thresholds - Shrink-wrapped 5-pack offers value for multi-door homes or maintenance projects - Replaces worn or missing inserts without door or hardware modification Specifications - Brand Name: M-D Building Products - Model Name: M-D 5520 - Part Number: 5520 - Product Type: Threshold Seal Insert - Material: Vinyl - Color / Finish: Gray - Size / Capacity: 36 in L x 3/8 in W - Product Dimensions: 36 x 0.375 x 0.375 in - Item Weight: 0.4 lb - Application: Low Threshold Doors - Self-Adhesive: No - Hardware Included: No - Packaging Type: Shrink-wrapped - Package Quantity: 5 - Country of Origin: United States - UPC: 043197552055 - Global Trade Identification Number: 00043197552055 - Manufacturer: M-D Building Products Product Application This threshold insert is used by homeowners and property managers to renew the bottom seal on pre-hung or slab doors with shallow threshold channels?common in older homes, apartments, and commercial entryways. It?s typically installed on interior or exterior doors where original vinyl seals have dried out, shrunk, or fallen out, restoring a continuous barrier against cold drafts in winter and hot, humid air in summer. Its tool-free installation makes it ideal for quick maintenance in multi-unit buildings or seasonal weatherization projects. By minimizing uncontrolled airflow, it supports HVAC efficiency while keeping out debris, crawling insects, and light rain splash?delivering a simple, cost-effective upgrade that enhances comfort without altering door hardware or flooring.