Selkirk RV 4" x 1-9/16" x 7-5/8" Storm Collar is an essential part of a Type B gas venting system designed to provide a secure, weatherproof seal around the gas vent pipe above the roofline. This storm collar effectively prevents water, moisture, and other weather elements from infiltrating the vent pipe system, helping to maintain its proper operation and avoid damage. For optimal installation, it is to apply high-temperature silicone sealant on the inner edge to create a watertight seal, ensuring the vent system remains durable and reliable even under harsh outdoor conditions. By using this storm collar, you enhance the safety and efficiency of your gas venting setup. Model Number: 104810