The Smith-Blair 441 OMNI Cast Coupling is designed to join plain end pipes with the same or different O.D.s by changing followers and gaskets. This versatile coupling system features heavy cast Ductile Iron parts for long life and meets applicable AWWA C219 Standards. Most couplings are stab fit, making installation a breeze with no disassembly required, while flanges and gaskets can be mixed and matched on the same size nominal sleeve for maximum flexibility in the field.

The 441 OMNI Coupling features a Ductile Iron sleeve manufactured to ASTM A536 specifications with ends that have smooth inside taper for uniform gasket seating. The gasket is Nitrile (Buna N) certified to NSF/ANSI 61G, compounded to produce superior storage and performance characteristics while resisting water, acids, alkalies, most (aliphatic) hydrocarbon fluids and other chemicals. Follower flanges are Ductile Iron ASTM A536, designed for high strength to weight ratio, and are color coded by pipe type: Red for iron pipe size O.D.; Blue for Ductile O.D.; and gray for Asbestos Cement O.D. High strength low alloy Steel bolts with heavy, semi-finished hexagon nuts to AWWA C219 (ANSI A21.11) are standard, with Stainless Steel available as an option. The coupling features Flexi-Coat® Fusion-Bonded Epoxy Finish.

The 441 OMNI Cast Coupling is rated for working pressures up to 250 PSI and is suitable for Steel, Cast Iron, Asbestos Cement, PVC and other pipe materials. For other pipe materials, contact Smith-Blair Engineering. The coupling offers up to 2.4" of range with a single coupling, reducing the need for large coupling inventories, and one sleeve per nominal pipe size takes the guess work out of deciding which sleeve size to choose. Gaskets and flanges are permanently marked with a part number and range to facilitate proper selection.

*Please visit the Resources page on our website to view the High Density Polyethylene Pipe (HDPE) guide with more specific information on how to use our products on HDPE pipe.

Available in sizes ranging from 2" through 16" for straight couplings and 2 1/2" through 8" for reducing transitions, the 441 OMNI Coupling System provides comprehensive coverage for a wide range of pipe joining applications. Sleeves are available in a variety of lengths, and custom length Steel sleeves are available for special applications. 

This product does not restrain pipe movement. Proper anchoring is required to prevent pipe pullout. Failure to anchor or improper anchoring can result in dangerous pipe content escape, property damage, serious injury, or death. Users must read the product installation instructions prior to installing this product.