Compression Coupling 3/4" X 3/4" X 3" Galvanized Malleable Iron - STZ 311CCL-34 The LDR Industries 311 CCL-34 3/4-inch compression coupling is a heavy-duty, malleable iron fitting designed for secure, leak-free connections in residential and commercial water, air, and steam piping systems. Constructed from ASTM A197-compliant malleable iron with a hot-dipped zinc coating, it resists corrosion, rust, and environmental degradation in wet or humid environments. The NPT (National Pipe Taper) threads ensure a tight, tapered seal when properly torqued ? eliminating the need for additional sealants in most applications. This compression-style coupling is FM and UL certified, hydrostatically tested, and protected with a clear varnish finish for long-term durability. Designed for use with threaded pipe and fittings, it provides a robust, code-compliant connection for plumbing, HVAC, and industrial installations. Features - Malleable iron construction meets ASTM A197, ASME B16.3, B16.14, B16.39, and B1.20.1 standards - Hot-dipped zinc coating provides superior corrosion resistance in water, air, and steam systems - NPT tapered threads ensure reliable, self-sealing connections without thread tape in most applications - FM and UL certified for safety and performance in residential and commercial systems - Hydrostatically tested to 300 psi for pressure integrity and leak-free operation - Clear varnish overcoat protects finish during storage and installation - Lead-free formulation ? contains ?0.25% lead, compliant with federal Safe Drinking Water Act - Compression design allows for slight misalignment and vibration absorption - Compatible with threaded steel, iron, or brass pipe up to 3/4 in NPT - Durable design withstands thermal expansion, pressure surges, and mechanical stress - Single-piece construction eliminates weak joints or weld failures - Silver/pewter finish blends with traditional and modern plumbing fixtures Specifications - Brand Name: LDR Industries - Model Name: LDR Industries 311 CCL-34 - Product Type: Compression Coupling - Material: Malleable Iron - Finish: Zinc-Plated (Hot-Dipped) - Size: 3/4 in NPT - Thread Type: NPT (National Pipe Taper) - Thread Size: 3/4 in - Connector Type: Coupling - Pressure Rating: 300 psi (tested) - Temperature Rating: Suitable for water, air, and steam applications - Weight: 1 lb (16 oz) - Dimensions: 4.3x2x2 in (LxWxH) - Certification: FM, UL, ASTM A197, ASME B16.3, B16.14, B16.39, B1.20.1, A-153 - Lead Content: ?0.25% ? compliant with federal potable water standards - Packaging: Single Unit - Country of Origin: United States - UPC: 019442157876 - GTIN: 00019442157876 - Part Number: 311 CCL-34 - Manufacturer: LDR Industries Product Application The LDR Industries 311 CCL-34 compression coupling is used by professional plumbers, HVAC technicians, and industrial maintenance crews connecting or repairing threaded pipe systems in residential, commercial, and light industrial settings. Ideal for water supply lines, compressed air systems, steam lines, and fire sprinkler branches, it provides a robust, code-compliant connection where threaded fittings require a secure, vibration-resistant joint. Its corrosion-resistant zinc coating and hydrostatic testing make it suitable for both new construction and retrofit applications in high-moisture environments such as basements, boiler rooms, and utility areas. Professionals trust its FM and UL certification and decades of LDR?s manufacturing heritage to deliver safe, durable, and long-lasting performance ? ensuring the quiet confidence that critical piping systems remain leak-free and code-compliant under pressure.