Installation diagram
5
MAINS
SUPPLY
Drain
Vent
Floor
Air gap
BACKF
LO
W PREV
Series:
5
73
Sizes:
1/2”
-
3/4
”
S/
N
VENT
BACKF
LO
W PREV
E
Series:
573
Sizes:
1/2”
-
3/4”
S/
N
VENT
Heating system application
MAINS
SUPPLY
Upstream
test cock
Upstream
shut-off valve
Downstream
shut-off valve
Downstream
test cock
Inlet test
cock
Backflow preventer
573 series
Y-strainer
BACKF
LO
W PRE
V
Series
:
5
73
Sizes:
1/2”
-
3/4
”
S/
N
VENT
Field testing installation
