IMPORTANT DISCLAIMER: We are NOT plumbing experts or professionals in water heater systems. We are selling this item as found from a recent bulk purchase. Please examine ALL photos carefully for condition details. This is a new-in-box item, but we have NOT installed or pressure-tested it—condition is unknown beyond visual inspection. Feel free to ask any questions BEFORE bidding or buying—we're happy to provide more pics or clarify anything!

New in Box A.O. Smith TW-5-1 Thermal Expansion Tank – 2.1 Gal Potable Water Heater Expansion Tank (TW Series) – Made in Italy

This is a brand-new, unused thermal expansion tank from A.O. Smith's Water Systems Division (Charlotte, NC) – designed for domestic hot water systems to prevent pressure buildup from thermal expansion in closed plumbing (e.g., with backflow preventers). Ideal for water heaters up to ~50 gallons. Helps avoid T&P valve drips, pipe stress, or code issues. Factory precharged and ready for install (professional recommended).

Key Specs:

• Model: TW-5-1
• Capacity: 2.1 gallons nominal
• Max Pressure: 150 PSI
• Precharge: Factory ~38-45 PSI (adjustable via air valve)
• Connection: 3/4" NPT male
• Dimensions: Height 11", Diameter 7.9"
• Features: Butyl rubber diaphragm, stainless steel fitting, polypropylene liner, epoxy coating, NSF/ANSI certified potable
• Max Temp: 200°F / 93°C
• Includes: Original box, labels/instructions (check photos)

Condition Notes (based on our inspection):

• New in original box—never installed or used (factory seals/labels intact, no visible damage, dents, or leaks from photos).
• Exterior clean with minor handling marks (typical for new old stock).
• We have NOT tested pressure, precharge, or function—sold as-is based on new/unused appearance.
• Vintage/new surplus plumbing part—no warranty transfer assumed (original 1-year limited may apply if registered).
• Sold strictly as-is—no returns for installation issues, compatibility, or performance unless grossly misrepresented. Professional installation advised!

Great for DIY water heater upgrades, plumbers, or stocking spares. Eliminates wasted water from relief valve discharge—code-compliant in many areas. Affordable plumbing essential!

Check high-res photos for details. Shipping from Lakewood, WA—carefully packed (heavy item). Combined shipping on multiple wins!

Questions? Message us—we'll respond quickly!