Dead End T on every water supply line in the house??

[Pierre Paul Rebelo]

In every sink in my house, in the water supply lines hot and cold, the pipe does not go diectly to the faucet instead there is a T fitting with one end going to a piece of vertical pipe that is Closed by an End fitting and the other end going to the faucet, why is this?

 

[Pierre Paul Rebelo]

IMG_0056

• Pierre Paul Rebelo
• Feb 14, 2019

 

[Diehard]

You'd have to ask the person that did it to be sure.
But it may have been solely for the purpose of serving as shock absorber chambers. Some plumbers apparently did that some time back to help avoid possibility of water hammer. However, they don't last very long, as the trapped air slowly gets lost in the water.
I assume there was no valve on that capped line.
Oops...just saw your picture.
Yeah I'd guess it's just trapping air to act as a shock absorber.

 

[bbp]

Air chamber. Still required by some codes but antiquated. Mechanical hammer arrestors on quick closing valves only, per my code.

 

[Diehard]

Air chamber. Still required by some codes but antiquated. Mechanical hammer arrestors on quick closing valves only, per my code.

I agree, quick closing valves as in solenoid valves and such, but I doubt it would be a requirement on any sink faucets.
That would be fine if they arranged it, with valving, so it could be drained when water logged. Similar to the old hydronic heating systems expansion tanks, prior to bladder tanks.

 

[PlumbGate]

Maybe they ran out of elbows.

 

[tanksnotanks]

In every sink in my house, in the water supply lines hot and cold, the pipe does not go diectly to the faucet instead there is a T fitting with one end going to a piece of vertical pipe that is Closed by an End fitting and the other end going to the faucet, why is this?

It's still required in San Fransisco