At Blackwidow Valves, we know our success depends on you—our customers. That’s why we’re dedicated to delivering durable, high-performance solutions you can trust. Our line of urethane rubber check valves—also known as flap valves, flap gates, or duckbill valves—are engineered for vacuum conveying systems and built to handle the toughest applications. Whether you need a standard size or a custom design, we’ve got you covered. Simply send us your specifications, and we’ll provide a tailored quote to keep your lines running strong.