Specifications

72
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Typical InstallationTypical Installation
400 Series Setter
Air Gap Drain AG Series
FeaturesFeatures ApplicationsApplications
• 2
1
/
2
”, 3”, 4”, 6”, 8”, 10”
• Setter assembly used to ease installation of Model
450/450DA/475/475DA backflow preventers
• Model FLS features flange by flange connection
• Model MJFS features mechanical joint connection by flange
• For use with 1/4” thru 10” Model 975 and 375, 475 reduced pressure
principle backflow preventers
• Can be mounted to relief valve body
Local codes shall govern installation requirements. To be installed in accordance with the manufacturers’
instructions and the latest edition of the Uniform Plumbing Code.
•
Model MJS features mechanical joint by mechanical joint connection
• Ductile iron construction
• Epoxy coated inside and out
For Additional Information, Ask For BF-SETTER or visit our web site.
• An air gap is necessary when installing a drain line
• Outlet pipe sizes 1” NPT – 4” NPT
For Additional Information, Ask For BF-AG or visit our web site.
Designed to ease the installation of the N-shape Wilkins Model 450 and 475 series
backflow prevention assemblies. Ideal for retrofitting installations or where space is
limited. The integral thrust support between the elbows eliminates the need for ad-
ditional concrete thrust blocking.
Designed for use with 1/4” through 10” Model 975, 375, and 475 reduced pressure
principle backflow preventers. Device is necessary when installing a drain line and can be
mounted to the body. The air gap drain attaches to any drain pipe with IPS dimensions. The
drain pipe must be properly supported.
(Model FLS Shown)
DIRECTION OF FLOW
12" MIN.
30" MAX.
PROTECTIVE
ENCLOSURE
AG-6
AIR GAP
DIRECTION OF FLOW
DRAIN
AIR
GAP
INDOOR INSTALLATION
MODEL SIZES FOR MODEL
AG-8 1/4" - 1/2" 975XL
AG-4 3/4" - 1" 975XL
AG-5 1 1/4" - 2" 975XL
AG-6 2 1/2" - 3" 475V
AG-6 2 1/2" - 6" 375, 475
AG-7 8" - 10" 375, 475
AG-9 4" - 6" 475V
AG-10 8" - 10" 475V
AG-11 3/4" - 1" 375
AG-11V 3/4" - 1" 375 VERT.
AG-12 1 1/4" - 2" 375
Backflow Preventer Accessories