• DIRECT REPLACEMENT FIT – Designed for 420LB propane cylinder tanks (Flame King Models YSN420ASME & YSN420DOT) for a secure and proper connection
• 1-1/4 NPT CONNECTION – Standard threading ensures compatibility with common tank openings and easy installation
• HEAVY-DUTY BRASS CONSTRUCTION – Built from high-quality brass for durability, corrosion resistance, and long service life
• LEAK-RESISTANT SEAL – Precision-machined threads with pre-applied sealant help prevent gas leaks and ensure safe operation
• RELIABLE FILLING PERFORMANCE – Engineered for efficient propane transfer and dependable use in residential, commercial, and industrial applications

The 420# ASME Fill Valve 1-1/4″ is a durable, direct replacement valve designed specifically for 420LB propane tanks, including Flame King models YSN420ASME and YSN420DOT. Featuring a standard 1-1/4″ NPT connection, it ensures a secure and proper fit for seamless installation. Constructed from high-quality brass, this fill valve offers excellent resistance to corrosion and wear, making it ideal for long-term use in demanding environments. Its precision-machined threads with pre-applied sealant help provide a tight, leak-resistant seal for safe and efficient propane filling. Built for reliability, this valve delivers consistent performance for residential, commercial, and industrial propane applications.