Radiator Steam Valve 1'', Bronze - ProLine 109-305 (3-PACK) The ProLine 109-305 is a 1-inch bronze radiator steam valve engineered for precise flow control in low-pressure steam or circulated hot water heating systems. Rated for 15 PSI working steam pressure (WSP) and up to 60 PSI non-shock hot water, this heavy-duty valve features a rising stem design with adjustable packing for reliable, leak-free operation over years of service. The heat-resistant hand wheel allows for safe, easy manual adjustment ? even in high-temperature environments ? while the neoprene-sealed disc ensures a tight, durable shut-off that resists wear and mineral buildup. Constructed entirely from solid bronze, the valve offers exceptional corrosion resistance and structural integrity in demanding residential, commercial, or industrial hydronic systems. The 3/4-inch male hose thread (MHT) outlet provides compatibility with standard piping configurations, making it ideal for radiator isolation, zone control, or system balancing applications. Weighing 544 grams (1.2 lbs) and measuring 11.43 x 10.16 x 5.84 cm, it?s compact yet robust ? designed for long-term reliability without maintenance or replacement. Trusted by HVAC professionals and plumbers, the Mueller 109-305 combines rugged performance with precise engineering ? making it an essential component for efficient, safe, and balanced heating system operation. Features - 1-inch inlet, 3/4-inch MHT outlet ? ideal for radiator and hydronic system installations - Rated for 15 PSI steam and 60 PSI non-shock hot water ? suitable for low-pressure heating systems - Bronze body and components ? corrosion-resistant and built for long-term durability - Rising stem design with adjustable packing ? ensures smooth operation and leak-free sealing - Neoprene disc seal ? provides tight shut-off and resists degradation from heat or minerals - Heat-resistant hand wheel ? safe, easy manual control even in high-temperature conditions - Compatible with steam, hot water, oil, or air ? versatile for multiple system types - Compact dimensions: 11.43 x 10.16 x 5.84 cm ? fits standard radiator and pipe configurations - Weight: 544 g (1.2 lbs) ? sturdy yet manageable for installation and service - Made by Mueller Industries ? trusted for professional-grade plumbing and HVAC components Specifications - Brand Name: ProLine - Model: ProLine 109-305 - Part Number: 109-305 - UPC: 032888093058 - Global Trade Identification Number: 00032888093058 - Product Type: Radiator Steam Valve - Material: Bronze - Connection Size: 1" Inlet, 3/4" MHT Outlet - Pressure Rating: 15 PSI WSP (Steam), 60 PSI (Non-Shock Hot Water) - Valve Type: Rising Stem, Manual Shut-Off - Seal Material: Neoprene - Hand Wheel: Heat-Resistant - Media Compatibility: Steam, Hot Water, Oil, Air - Item Weight: 544 g (1.2 lbs) - Product Dimensions: 11.43 cm L x 10.16 cm W x 5.84 cm H - Item Package Quantity: 1 - Batteries Required: No - Manufacturer: Mueller Industries - Country of Origin: United States Product Application The ProLine 109-305 steam valve is engineered for use in residential and light commercial radiator systems where precise flow control and reliable shut-off are critical. Ideal for isolating individual radiators, balancing heat distribution, or servicing hydronic loops, its bronze construction and neoprene seal ensure dependable performance under continuous thermal cycling. Whether installed in vintage steam-heated homes or modern hot water baseboard systems, this valve delivers professional-grade durability and control ? helping maintain system efficiency, safety, and comfort. A trusted, no-maintenance solution for plumbers, HVAC technicians, and facility managers who demand long-lasting, code-compliant components.