Oil lubricates cylinders and keeps valve seals soft and limber — among other things — and small amounts are burned or otherwise consumed as this happens. This shouldn't be noticeable on a ...

There are many methods of sealing valve stems on control and isolation valves. When chosen carefully, a valve stem seal provides years of reliable service, reduces environmental emissions, and ...

The flapper (aka “flush valve seal”) is the plug that falls against the drain hole (flush valve drain seat) on the bottom of the tank and holds water in until the next time you flush.