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The CARRHILL SR1121 is a socket fusion reducer coupling designed for use in medium-density polyethylene (MDPE) yellow gas distribution systems. This fitting reduces from a 1.5-inch socket to a 1-inch socket and is joined using standard socket fusion tooling, creating a leak-resistant thermoplastic bond. The yellow color coding identifies it as a gas-service fitting in accordance with common industry convention. It is installed by plumbers and gas fitters working on underground or above-ground MDPE gas piping systems in residential and light commercial applications.
This coupling is suited for natural gas and propane distribution piping built with MDPE yellow pipe. It is used at transition points where a larger-diameter run must reduce to a smaller branch or service line. Typical installations include service laterals, meter sets, and distribution mains where pipe sizes change. The socket fusion joining method requires matched fusion tooling and proper heating time to achieve a full-strength joint per manufacturer and code requirements.
Designed as an OEM-style socket fusion fitting for yellow MDPE gas distribution piping systems using 1.5-inch and 1-inch pipe sizes.
Installation must be performed by a licensed plumber or gas fitter in accordance with applicable codes, including IFGC and local gas utility requirements. Power down or shut off gas flow and depressurize the line before cutting into any existing piping. Proper socket fusion requires clean, dry pipe ends, correct fusion tool temperature, and adherence to published heating and cooling times. Do not use solvent cement, mechanical fittings, or other joining methods with this socket fusion fitting.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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