The 3" Inside Caulk Cast Iron Roof Drain from Braxton Harris Co Inc is engineered for efficient water drainage in roofing systems. This durable drain is made from high-quality cast iron, providing strength and longevity. The 3" diameter allows for optimal water flow, preventing pooling and potential damage to roofs. Designed for inside caulk installation, it ensures a secure and watertight seal. This roof drain meets industry standards for performance and reliability, making it an essential component for both residential and commercial roofing applications.