What did this come from? Please, help

[MonkeyMonk86]

I put together a Fluval U3 filter and a sanitizer. I found this on the floor and can't find it in either set of direction.

 

[missnathasha]

Looks like a bubbler on the end of that.

 

[melosu58]

Looks like the air muffler that I have on my skimmer. It sucks in the air and is quite noisy. That muffler on the end quiets things down considerably.

 

[MonkeyMonk86]

Could it have come out of a decoration? I sanded that resin driftwood in the same area where I sat to put the sanatizer and U3 together. Is it possibly important or useful to have?

 

[MonkeyMonk86]

I'd edit but can't add a pic that way. I found the hole. So yeah there is an open end and the black end has a hole for open and close. . Could it be for the sanatizer? Or the U3?

 

[Rutrag]

It looks like an air inlet valve to me. They are usually used for venturis on protein skimmers or for the air inlet on a powerhead.

 

[MonkeyMonk86]

I'm still lost. I didn't install either a protein skimmer or a power head but on the sanitizer there is a thing like a parascope that has to be out of water and on the fluval there is a Venturi system. No pic. Just says if using Venturi system put the Venturi valve into top of vent. Which I did, but had no clue what it was talking about.

 

[MonkeyMonk86]

Diagram of uv sanitizer

 

[MonkeyMonk86]

One decoration has an airstone inside