This replacement filter cartridge comes with a technical specification of Filbur# FC-0151, Pleatco # PTL50P, Unicel # 4CH-50, and OEM # 1561-05, 6540-486. This is a high performance filter cartridge. This state of the art Aqua Tech Spa, American Classic Spas, Spillway spas, Dynasty Spas, LA Spas, Nemco, Great Northern Engineering, Dimension One Spas, OpuSpas, Advanced Spa Design, Addison Spas, Florida Whirlpool filter is of superior quality as per industry standards. This filter comes with a moulded cone handle at the top and 1-1/2" MPT at the bottom. It is 14 3/4" in length and 4 5/8" wide. It efficiently provides you dust, sand and worm free clean and clear water solution for your pools and spas. The best in the industry this product matches all your water purifying needs and offers quality with cleanliness and hygiene par excellence