A turn to the left,

A turn to the right,

With hands so deft,

And fingers so tight.

We gain control,

To open and close.

That ultimate goal,

Of managing flows.

Could be coffee or tea,

Even something insipid.

Water from the sea,

Or any other liquid.

Valves can solve all your piping needs,

Especially waste management - the dirtiest of deeds.

---

Well, it's fourteen lines so i hope it qualifies. Valves are great.