Replacing a check valve
1 of 2
Photo 1: Remove the old valve
Push a long screwdriver up into the old
check valve to drain the water above
2 of 2
Photo 2: Install the new valve
Push the pipe fully into the rubber
sleeves of the check valve, then tighten
the band clamps to seal the joints.
Waste lines from a sewage ejector or
sump pump use a check valve to stop
wastewater from flowing back into the
basin. When these valves shut, they
can make a thud loud enough to be
heard throughout the house.
To quiet them, replace the old check
valve with a “silent” or “soft close”
Remove the section of waste line
under the check valve, disconnecting
it at the union or coupling above the
basin—or cutting the pipe.
Drain the water above the check valve,
then loosen the clamps and remove it
(Photo 1). If you don't have a shutoff valve
above the check valve, install a “full
port” shutoff valve on the waste
line above the check valve. You won't
get soaked with dirty water the next
time you service the check valve.
Cut the waste pipe to the proper
length and attach the silent check
valve (Photo 2). Reassemble the pipes,
open the shutoff valve and turn on the
Silent check valves are available
from most plumbing suppliers. If you have trouble locating one locally, search the internet for silent or soft close check valves.