Smith-Blair offers 1.25-inch (1-1/4") couplings in various configurations, primarily within their compression and bolted coupling lines. These are typically used for joining plain-end pipes of the same diameter and are constructed from durable ductile or malleable iron.
Available Models and Features
Style 525 Compression Coupling
: A common 1.25-inch model designed for steel, PVC, and copper pipe (with adapter gaskets).
Construction: Made of ductile or malleable iron with a galvanized finish for corrosion resistance.
Installation: Features a "stab fit" design, eliminating the need for threading or additional fastening.
Seal: Uses Nitrile (Buna-N) gaskets, making it resistant to many chemicals, water, and wastewater.
Style 411 Bolted Coupling
: While some 411 models are listed as steel, there are ductile iron variations for small pipe sizes (e.g., 0.5-inch through 2-inch) that meet AWWA C219 standards.
Key Specs: Rated for a temperature range of -20°F to 180°F.
Benefits: Dampens vibration to reduce pipe fatigue and allows for limited expansion and contraction.
Specifications & Compliance
Standards: Most 1.25-inch ductile iron couplings meet applicable AWWA C219 standards for pipe couplings.
Gaskets: Standard gaskets are Nitrile (Buna-N), which are resistant to acids, alkalies, and most aliphatic hydrocarbons.
Temperature Range: Typically rated for -20°F to +180°F.