No leaks : The drain plugs use an antivibration design to provide a secure, tight fit that does not loosen at speeds, helping prevent accidental water entry. durability: Constructed from 316 stainless steel, these plugs resist rust, wear, and erosion in harsh marine conditions, delivering longlasting protection and reliable performance. Waterproof protection: Engineered for sealing, these plugs help keep the cabin dry and protect against moisture ingress even in wet conditions. Seamless fit and compatibility: 1/2 inch BSPT connector diameter and 2 inch flange diameter, designed to fit 1 inch drainage holes on a range of vessels including fishing boats, fast boats, and luxury yachts, delivering a dependable, airtight seal. Specifications: Connector diameter: 1/2 inch BSPT Flange diameter: 2 inches Hole size compatibility: fits 1 inch drainage holes Material: 316 stainless steel Applications: suitable for fishing boats, fast boats, luxury yachts Use scenarios: speed boating: Installed on fast boats or sport yachts to maintain a leak seal during rapid acceleration and rough seas, reducing risk of water ingress. Harsh marine environments: In saltwater or exposed moorings, the corrosionresistant stainless steel maintains integrity and seals effectively to protect the cabin from moisture. Maintenance and storage: After washing down or during winterization, seal drainage holes to keep the bilge and cabin dry and shielded from residual moisture.