Coupling & Repair

Dresser Style 721 Transition Fitting

For Fast, Trouble-free Steel to PE Transition Connections 

Dresser introduced the Style 721 Transition Fitting to the market for quick, reliable Steel to PE transition connections for gas distribution mains. They are engineered for full compliance with the attendant gas distribution industry standard ASTM F1973. The Style 721 steel bodies are coated with Dresser ALCLAD™ fusion bonded epoxy with 2” layback for field welding. The weld end comes factory-beveled. 

The monolithic body design simplifies traceability and removes any requirement to qualify, track and trace additional pressure containing components. The heat code for the steel is stamped in the tailpiece adjacent to the weld prep assuring 100% traceability of the pressure containing metallic content. This design enhancement also reduces weight of the finished fittings. 

Dresser Style 721 fittings are offered for nominal pipe sizes 3” thru 12” (standard wall steel) x SDR11 polyethylene (medium density 2708 and high density 4710). Other dimension ratios and steel end preparations can be accommodated upon request. 

• ASTM F2897 traceability information will be listed on each fitting 
• The bevel will be industry standard weld-prep angle: 30 – 37.5 degrees 

Required data for all product inquiries and ordering Dresser Style 721 transition fittings: 

• Pipe size 
• PE cell classification (2708 or 4710) 
• Dimension ratio required (SDR 11 standard) 
• Approved extruder(s) for PE pipe 
• Steel pipe wall thickness if not compatible with standard wall/Schedule 40 
• Any special requirements or custom configurations