| ITEM | 
                                                    PART NAME | 
                                                    CARBON STEEL SEAT | 
                                                    STAINLESS STEEL SEAT | 
                                                
                                                
                                                    | 1 | 
                                                    Body | 
                                                    ASTM A105, Normalized | 
                                                    ASTM A105, Normalized | 
                                                
                                                
                                                    | 2 | 
                                                    Seat | 
                                                    Replaceable Carbon Steel | 
                                                    Replaceable 316 Or 17-PH Stainless Steel | 
                                                
                                                
                                                    | 3 | 
                                                    Disc | 
                                                    Replaceable 316 Stainless Steel | 
                                                    Replaceable 316 Stainless Steel | 
                                                
                                                
                                                    | 4 | 
                                                    O-Ring | 
                                                    Seat Seal: Fluorocarbon | 
                                                    Seat Seal: Fluorocarbon | 
                                                
                                                
                                                    | 5 | 
                                                    O-Ring | 
                                                    Assembly Seal: Buna-N | 
                                                    Assembly Seal: Fluorocarbon | 
                                                
                                                
                                                    | 6 | 
                                                    Retainer | 
                                                    Stainless Steel | 
                                                    Stainless Steel | 
                                                
                                                
                                                    | 7 | 
                                                    Set Screw | 
                                                    Stainless Steel | 
                                                    Stainless Steel |