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Anti-Siphon Valves
Anti-siphon valves are an inexpensive choice and easy to install and maintain. The
built-in anti-siphon backflow device prevents potential contamination of household wa-
ter supplies from fertilizers and other toxic chemicals which may enter the system.
Check your local codes for the types of backflow protection required in your area.
Electric models are simple to hook up to a timer for automatic watering. They are best
suited to plans where there is not more than a slight rise in elevation, and fairly clean
source water.
Caution: This valve is designed as a zone valve and as such may suffer severe dam-
age if installed where constant pressure is placed on the outlet (sprinkler) side of the
valve. The manual version is not suitable for use in a continuous open position as a
main shutoff valve or as a means of inexpensive backflow prevention for an entire sys-
tem; nor are the automatic models to be used as a master valve where other valves
will be installed downstream.
(Note: A master valve is an electric valve that is automatically activated to open and
allow the flow of water through, only when the zone valves downstream are activated.)
Automatic Anti-Siphon control
valves APAS-075-P/APAS-100-P
Connecting pipe
from water source
PVC Pipe
Shutoff
To Sprinklers
Typical installation
using PVC pipe and
fittings
Install valves
at least 6”
above
the highest
sprinkler
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