Check the listing for details. Ocean Kayak Scupper Valves (Set of 2). Condition: New. Listed at 9.95 USD. Patent pending valve designed to help keep water from entering via the scuppers AND to drain any water that may come over the side while you are paddling. Click the hyperlink below to find out which models the scupper valve fits.http://www.oceankayak.com//uploadedFiles/Website_Library_Assets/Files/Product_Support/Scupper%20Size%20Chart%20(Sep10-13).pdfMedium Valve Approximate Dimensions : 1.250-1.375 in. Dia.. 2.5" LongSold in Medium Only. For Ocean Kayaks..May fit other applications but NOT guaranteed.Brought to you by TGWatersports.com where we are a specialized dealer in the kayak and canoeing world bringing you the the products you need to keep you on the water! Be sure to check out our website for more products or special orders.Patent pending valve designed to help keep water from entering via the scuppers AND to drain any water that may come over the side while you are paddling. Click the hyperlink below to find out which models the scupper valve fits.http://www.oceankayak.com//uploadedFiles/Website_Library_Assets/Files/Product_Support/Scupper%20Size%20Chart%20(Sep10-13).pdfMedium Valve Approximate Dimensions : 1.250-1.375 in. Dia.. 2.5" LongSold in Medium Only. For Ocean Kayaks..May fit other applications but NOT guaranteed.Brought to you by TGWatersports.com where we are a specialized dealer in the kayak and canoeing world bringing you the the products you need to keep you on the water! Be sure to check out our website for more products or special orders.