Description
The Bell & Gossett 1BN321LF (Model PT-42V) is a high-performance diaphragm expansion tank engineered for potable hot water systems. Factory precharged and ready for installation, this lead-free tank is designed to absorb the thermal expansion of heated water, protecting system components and maintaining safe operating pressures throughout your hydronic or domestic hot water system.
Key Specifications
- Tank Volume: 20.0 Gallons
- Maximum Working Pressure: 100 PSI
- Maximum Operating Temperature: 200°F
- Factory Precharge Pressure: 38 PSI
- Construction: Non-ASME
- Lead Free: Yes — compliant for potable hot water applications
- Tank Type: Diaphragm Expansion Tank
- Model: PT-42V
- SKU: 1BN321LF
Product Highlights
- Factory precharged to 38 PSI for quick, straightforward installation
- Lead-free construction meets requirements for use in potable hot water systems
- Diaphragm design separates the system water from the air charge, preventing waterlogging and extending service life
- Rated for up to 100 PSI working pressure, suitable for a wide range of residential and light commercial applications
- 200°F maximum operating temperature handles demanding hot water system conditions
- Non-ASME construction provides a cost-effective solution for standard system requirements
Applications
- Potable domestic hot water systems
- Residential and light commercial hydronic heating systems
- Closed-loop plumbing systems requiring thermal expansion control
Trust Bell & Gossett’s proven engineering to keep your system pressure stable and your components protected. The PT-42V is a reliable, code-compliant choice for contractors and engineers specifying expansion tanks in potable water applications.







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