NSF/ANSI-Standard Expansion Tanks

	Capacity Capacity

2.1 gal.

4 1/2 gal.

8 1/2 gal.

	Mounting Orientation Mounting Orientation

Horizontal

Vertical

	For Use With For Use With

Drinking Water

	Diameter Diameter

10 1/2"

12 1/2"

	Overall Length Overall Length

11"

13 1/2"

19 3/16"

	Expansion Tank Type Expansion Tank Type

Diaphragm

	Maximum Pressure Maximum Pressure

Less than 250 psi

	Material Material

Steel

	Finish Finish

Painted

	Maximum Temperature Maximum Temperature

200° to 249° F

	Color Color

	Beige

	Environment Environment

Food and Beverage

	Specifications Met Specifications Met

NSF/ANSI

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	Diaphragm Material Diaphragm Material

Rubber

	Wall Gauge Wall Gauge

16 ga.

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

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3 Products

Expansion Tanks for Drinking Water

End View

These tanks meet NSF/ANSI Standard 61 for use with drinking (potable) water. Use them to accommodate the expansion of heated water and provide a cushion of compressed air in closed water-heating systems. All of these tanks have a diaphragm, which completely separates air and water. They prevent water loss by eliminating the need to expel hot water from systems during each heating cycle.

For technical drawings and 3-D models, click on a part number.

			Tank End (E1)
Capacity, gal.	Dia.	Overall Lg.	Connection Pipe Size	Pipe Connection Thread Type	Pipe Connection Gender	Wall Gauge, ga.	Max. Temp., °F	Max. Pressure, psi	Diaphragm Material	Specifications Met		Each
Beige-Painted Steel
2.1	8"	11"	3/4	NPT	Male	16	200°	150	Butyl Rubber	NSF/ANSI 61	000000	000000
4.5	10 1/2"	13 1/2"	3/4	NPT	Male	16	200°	150	Butyl Rubber	NSF/ANSI 61	000000	000000
8.5	12 1/2"	19 3/16"	3/4	NPT	Male	16	200°	150	Butyl Rubber	NSF/ANSI 61	000000	000000