The Pentek PO5G4S bag filter has a galvanized carbon steel ring sewn in at the top of the filter bag. The filter bag also comes with a handle for fast, easy bag filter changes. The PO5G4S filter bag is made of FDA-compliant materials. These high flow filter bags are single layer for straining and filtering at high flow rates. The Pentek PO5G4S Polypropylene Felt Filter Bags are a Size #4 which means they are 4-1/8 inches in diameter and 14 inches in length. The bag filter area is 1.0 square feet. Pentek PO5G4S Polypropylene Felt bag filters are compatible with a broad range of corrosive fluids including organic solvents, oils, acids, alkalis and microorganisms. The Pentek PO5G4S Polypropylene Felt Filter Bags can withstand temperatures up to 200°F. Manufacturer: Pentek 255099-03 Pentek PO5G4S Filter Bag Alternate Part #s: Pentek # P05G4S Filter Bag Pentek # 255099-03 Filter Bag Formerly Ametek # 255099 Filter Bag Formerly US Filter # 255099-75 Filter Bag Grainger # 4BE67 Filter Bag.