Brand Name
Type
Pressure
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Amtrol Parts B135-41 Diaphragm Type Expansion Tank 4.4 Gallon 1/2" MPT 30 Lbs
  • Accepts expanded water as system temperature rises to reduce pressure build-up
  • Helps reduce energy consumption and reduces system wear
  • Suitable in propylene glycol applications with mixtures up to 50%
  • Heavy-duty butyl/EPDM diaphragm
  • Steel system connection
  • Projection welded air valve
  • Made in USA
Item#:
B135-41
Manufacturer Item:
389710
Manufacturer:
AMTROL INC
Amtrol Parts Amtrol Parts B135-40 Diaphragm Type Expansion Tank 2 Gallon 1/2" MPT 15 Lbs
  • Accepts expanded water as system temperature rises to reduce pressure build-up
  • Helps reduce energy consumption and reduces system wear
  • Suitable in propylene glycol applications with mixtures up to 50%
  • Heavy-duty butyl/EPDM diaphragm
  • Steel system connection
  • Projection welded air valve
  • 1 Gallon maximum acceptance volume
  • Made in USA
  • 13" H x 8" Diameter
Sid Harvey Item #:B135-40: Replaces Part #:'s : 3207
Item#:
B135-40
Manufacturer Item:
389695
Manufacturer:
AMTROL INC
FLEX2PRO Paint 16 ga Cold Rolled Steel Hydronic Expansion Tank 4.5 Gallon 1/2" MNPT 14" H x 11" Diameter
  • 100% butyl rubber, lined with polypropylene water chamber
  • Appliance quality paint for corrosion resistance
  • 100% butyl rubber diaphragm
  • Welded steel connection
  • High pressure, seam weld, helium, final pre-charge check testing
  • Brass valve with o-ring seal air valve
  • 2.5 Gallon maximum acceptance volume
  • 5 years warranty
Item#:
HT30
Manufacturer Item:
HTX30
Manufacturer:
FLEXCON INDUSTRIES
BackStop H30 Metallic Silver Paint Carbon Steel Diaphragm Type Hydronic
Item#:
12-H30
Manufacturer Item:
H30
Manufacturer:
DURATRAC PRODUCTS
Amtrol Parts B135-61 Diaphragm Expansion Tank 4.4 Gallon 1/2" NPTM 100 psig 30 Lbs
Item#:
B135-61
Manufacturer Item:
389780
Manufacturer:
AMTROL INC
BackStop 12-H60 Hydronic Diaphragm Expansion Tank, 6 gal, 1/2 Inch, 16-5/8
Item#:
12-H60
Manufacturer Item:
12-H60
Manufacturer:
WATTS REGULATOR CO
Flexcon Flex2pro PH5 16 ga Cold Rolled Steel Thermal Expansion Tank, 2.1 Gallon, 3/4" MNPT, 200 psig, 11" H x 8" Diameter
  • 100% butyl diaphragm and plastic liner to separate the system water from the tanks air precharge
  • Stainless steel sleeve to prevent corrosion, something no other manufacturer offers
  • Top chamber is 100% butyl rubber, lower water chamber is copolymer polypropylene
  • High pressure, seam weld, helium, final precharge check testing
  • Brass valve with o-ring seal
  • 0.9 Gallon maximum accepted volume
Item#:
PH5
Manufacturer Item:
PH5
Manufacturer:
FLEXCON INDUSTRIES
Amtrol Parts B135-60 Diaphragm Expansion Tank W/Fill Valve 2 Gallon 1/2" FNPT 100 psig
Item#:
B135-60
Manufacturer Item:
389767
Manufacturer:
AMTROL INC
Amtrol Parts B135-68 Diaphragm Expansion Tank W/444 Purger 4.4 Gallon 1/2" NPTM 100 psig
Item#:
B135-68
Manufacturer Item:
389782
Manufacturer:
AMTROL INC
Constructed of the highest quality steel, the HTx are true work horses. HTx comes standard with a 100% butyl diaphragm. SxHT goes even one step further with our patented CAD2 diaphragm, offering even lower permeability rates at higher temperatures. Additionally, both tank lines' diaphragms are oversized, which maximizes drawdown and minimizes wear. This design feature virtually eliminates diaphragm stretch, further promoting longevity.
  • 16 ga cold rolled steel tank
  • Appliance-quality paint for corrosion resistance
  • 100% butyl rubber diaphragm
  • Welded steel connection
  • High pressure, seam weld, helium, final precharge check testing
  • Brass valve with O-ring seal air valve
  • 1 Gallon maximum acceptance volume
  • 5 years warranty
Item#:
HT15
Manufacturer Item:
HTX15
Manufacturer:
FLEXCON INDUSTRIES
Zilmet ZEP-05 Expansion Tank 2.1G 3/4 MPT
Item#:
ZEP-05
Manufacturer Item:
ZEP-05
Manufacturer:
ZILMET USA CORP
Zilmet ZHT8-15 Expansion Tank 15
Item#:
ZHT8-15
Manufacturer Item:
ZHT8-15
Manufacturer:
ZILMET USA CORP
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