Description Dresser Style 90 Compression Fittings The Dresser Style 90 is a complete family of gas service fittings engineered for joining steel pipe on natural gas service lines from main to meter. Built on a time-proven compression sealing principle, every Style 90 fitting ships fully assembled and ready to install — no threading, welding, or special tools required. The boltless design uses threaded end nuts that compress resilient, cup-protected gaskets against the pipe to form a flexible, gas-tight seal rated at 150 PSI standard. Style 90 fittings are available in cast iron and steel bodies, in 5" and 10" middle ring lengths, with a full range of configurations: straight couplings, reducing couplings, 45° and 90° ells, street ells, tees, riser tees, male adapters, line caps, and the Tap-N-Valve® tee for service connection taps. Insulating versions are available throughout the line for cathodic protection applications — including full-sleeve insulating couplings, insulating reducing couplings, insulating ells, and insulating street tees. Plastisol-coated versions are also available for buried service. Key Features Ships fully assembled — no threading, flaring, or welding required; installs in minutes Cup-shaped gasket retainer protects gasket from damage and provides consistent sealing performance Flexible joint absorbs expansion, contraction, vibration, and up to 3° pipe-end deflection 150 PSI standard working pressure; other pressures available on request Insulating versions provide full electrical isolation for cathodic protection systems Available in cast iron, steel, and plastisol-coated steel for buried or exposed service Complete fitting family: couplings, ells, tees, reducers, adapters, line caps, and Tap-N-Valve® tees Sizes 1/2" through 2" IPS (3/4" through 2" for most fitting types) How It Works Two heavy end nuts thread onto the fitting body, compressing specially compounded resilient gaskets against the pipe. Cup-shaped retainer rings confine and protect each gasket, preventing friction between the gasket and end nut and providing an accurate sense of tightness during installation. The result is a flexible, bottle-tight seal on plain-end pipe that requires no pipe preparation beyond cleaning. Available Configurations Configuration Seal Type Sizes (IPS) Cast & Steel Couplings — 5" Middle Ring Seal Only 1/2" – 2" Steel Couplings — 10" Middle Ring Seal Only 3/4" – 2" Reducing Couplings Seal Only 3/4"×1/2" – 2"×1-1/2" 45° Ells Seal Only 1" – 2" 90° Ells (Plain, Street, Threaded) Seal Only 3/4" – 2" Street Tees & Regular Tees Seal Only 3/4" – 2" Tap-N-Valve® Tees (Weld & MIPS Inlet) Seal Only 3/4" – 1" Male Adapters & Line Caps Seal Only 3/4" – 2" Cast & Steel Insulating Couplings — 5" Ring Insulating 3/4" – 2" Steel Insulating Couplings — 10" Ring Insulating 3/4" – 2" Insulating Reducing Couplings, Ells, Street Tees Insulating 3/4" – 2" Plastisol Coated — Cast & Steel (Conductive & Insulating) Seal / Insulating 1/2" – 2" Straight Coupling Dimensions — Cast & Steel, 5" Middle Ring Nom. Size (IPS) OD (in) Dim. A (in) Dim. B (in) Dim. C (in) 1/2 .840 2 5-7/8 5 3/4 1.050 2-7/32 5-7/8 5 1 1.315 2-9/16 5-7/8 5 1-1/4 1.660 3 5-7/8 5 1-1/2 1.900 3-3/8 5-5/16 5 2 2.375 4 6-1/8 5 All dimensions are maximum, approximate, and given in inches. Dim. A = end nut O.D.; B = overall length; C = middle ring length. ? PIPE PULLOUT WARNING: Where pipe movement out of the coupling could occur from forces beyond 150 PSI internal pressure, the pipe joint MUST be anchored. Failure to anchor could result in escaping line content causing property damage, serious injury, or death. Need a specific configuration or size? Contact us at [email protected] or 281.664.8000 — we can help confirm part numbers for your specific application including insulating, plastisol, and Tap-N-Valve® configurations. Brochure Style 90 Seal-Only Gas Service Fitting Brochure Data Sheet Style 90 Insulating/Restraining Data Sheet
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