The PlumbCraft 4 In. Air Vent Cap provides great defense against debris and unwanted guests in vent stacks. Crafted to perfection, this vent cap fits seamlessly inside a 4 In. pipe, offering a secure barrier against debris and pesky critters. Versatile and reliable, it's suitable for both 4 In. fresh air vents and cast iron spigots, ensuring compatibility with various plumbing setups. Constructed with durable materials, so you can trust it to last for years.