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Model #PLT-12

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4.5 Gal. Lead Free Potable Water Expansion Tank, Model #Plt-12, Stainless Steel Nipple

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Product Overview

This potable water expansion tank is used on gas, oil or electric, direct-fired, residential water heater and hot water storage tank applications to absorb the increased volume of water created by thermal expansion. It also maintains balanced pressure throughout the water supply system by keeping system pressure below the T andP relief valve setting. This field-adjustable steel tank is air pre-charged at 20 psi volume 4.5 Gal. designed with an FDA-approved polypropylene liner and Butyl rubber diaphragm, copper-lined steel and 3/4 in. male inlet connection. An expansion membrane prevents air-to-water contact in the tank ensuring a long system life. IAPMO listed and ANSI/NSF 61 certified. The maximum pressure is 150 PSI (10 BAR).
  • Prevents over-pressure caused by thermal expansion
  • Air pre-charge at 20 psi
  • 3/4 in. male connection
  • Butyl rubber diaphragm
  • Absorbs the increased volume of water created by thermal expansion
  • Prevents air-to-water contact in the tank
  • 150 psi maximum pressure
  • Keeps system pressure below the T and P relief valve setting
  • Ensures long system life
  • Can be used in gas, oil, and residential heater/hot water applications
  • Obsoleted as per IBI request
  • California residents

Info & Guides

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Product Depth (in.)
Product Height (in.)
Product Width (in.)


Potable Water
Compatible Brand/Model
Universal Water Heaters
Finish Family
Steel Tank with an FDA-approved polypropylene liner and Butyl rubber diaphragm
Nominal Tank Capacity (gallons)
Pack Size
Product Weight (lb.)

Warranty / Certifications

Manufacturer Warranty
Watts (the "Company") warrants each product to be free from defects in material and workmanship under normal usage for a period of one year from the date of original shipment. In the event of such defects within the warranty period, the Company will, at its option, replace or recondition the product without charge.

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