Replaces Unicel # C-8350, Pleatco # PVT50W, Filbur # FC-3053 and complies with OEM # PVT 50W specifications. It is a great quality replacement filter and capable of handling the top load of 50 sq ft. It has 1 9/10 inch open hole at its top while 2 3/8 inch hole at bottom. It is best fit for Vita Spa, DM Industries, Pleatco. This 7 ¼ inch long and 8 ½ inch wide replacement filter provides you clean and clear water for your pools and spas.