Submittal Sheet

Series AS-MB Microbubble Air Separator is designed for effi-
cient separation and elimination of entrained air in hydronic
heating systems. Offered in sizes
3
/4" - 2" Threaded, and
3
/4" - 1
1
/4" Solder, and 1
1
/4" Flanged.
Features
Durable forged brass body construction. Series AS-MB does
not require laminar flow for efficient separation and elimination
of entrained air in hydronic heating systems. There is no mini-
mum inlet/outlet piping length required for proper operation of
AS-MB Microbubble Air Separators.
Rugged, polyphenylsulfone (PPSU) coalescing media with-
stands petroleum based cleaners, glycol anti-freeze and tem-
peratures up to 240º degrees in closed-loop heating systems,
and methanol based anti-freeze solutions in ground source
heat pump loops.
DuoVent air vent assembly consists of a brass cover, air vent
with silicone rubber seal, shutter, polyethylene float with valve
plug, automatic vent with black cap and manual vent with red
cap. Air vent assembly has a high capacity and high tempera-
ture rating and is ideal for use with glycol systems or for use as
an anti-vacuum device.
Fully serviceable - can be disassembled for inspection
and cleaning.
½" FPT bottom tapping for use with Series RBFF Residential
Boiler Fill Fitting
AS-MB FL flanged model can be used with Series PIPF
Isolation Pump Flanges with Purge Port & Swivel Flange to
create a compact system purge/air elimination module.
Specifications
A microbubble air separator shall be installed as indicated on
the plans. Separator shall be of forged brass construction with
serviceable/replaceable coalescing media and air vent assem-
bly and include a tapping for connection of boiler fill valve and
expansion tank. Separator shall be a Watts Series AS-MB.
Watts product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements,
please contact Watts Technical Service. Watts reserves the right to change or modify product design, construction, specifications, or materials with-
out prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.
For Hot Water Heating Applications
ES-AS-MB
Job Name
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Contractor
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Job Location
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Approval
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Engineer
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Contractor’s P.O. No.
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Approval
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Representative
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AS-MB-FLANGED
AS-MB-SWEAT
AS-MB-THREADED
C
v
Ratings
3
⁄4" C
v
= 10.2 GPM
1" C
v
= 15.0 GPM
1
1
⁄4" (thread, solder and flange) C
v
= 23.1 GPM
1
1
⁄2" (thread) C
v
= 25.0 GPM
2" (thread) C
v
= 37.5 GPM
Series AS-MB
Microbubble Air Separator
Sizes:
3
⁄4" – 2" (20 – 50mm) Threaded
3
⁄4" – 1
1
⁄4" (20 – 32mm) Solder
1
1
⁄4" (32mm) Flanged