1.5 inch anti siphon adaptor designed to prevent trap seal loss caused by negative air pressure in waste systems Helps maintain proper drainage flow and prevents foul odours from entering through basin or sink waste outlets Manufactured from durable black plastic for long lasting reliability and resistance to household chemicals Produced by McAlpine for compatibility with a wide range of basin and sink plumbing installations, Weight: 0.158291904116 pounds, Manufacturer: McAlpine