Reference:
I360TA
"The IAX-100 is a 33 "" extension tube used to extend the length of the IAI-100."
AIPHONE™ IAX-100 Security Window Speaker Tube
![AIPHONE™ IAX-100 Security Window Speaker Tube [I360TA]](http://emacspruebaamerica.myshopify.com/cdn/shop/products/I360TA_grande.png?v=1497279602)