Fully
recirculating
valve.
A
quiet
alternative
to
the
atmospheric
BOV,
the
Plumb
Back
systems
vents
all
excess
pressure
back
into
the
intake
system.
.
Ideal
for
cars
with
sensitive
Air-Flow
systems
and
off-road
applications
as
the
fully-sealed
design
of
the
Plumb
Back
prevents
any
foreign
matter
entering
the
system.
