How to clean the foam tube to reuse
There are several solutions to this problem, but the slickest we've found is to buy a can of carb and choke cleaner (at auto parts stores) and use it to clean uncured foam from the tube and trigger immediately after you're done applying foam.
The acetone in carb cleaner works perfectly on expanding foam.
And the straw included with the carb cleaner is just right for inserting into the foam applicator straw.
Be sure to wear safety glasses because the pressurized cleaner can blow back when you're cleaning the straw.

These spray foam replacement tubes fit all major brands of foam sealants.

They can be used to fill,seal, and insulate gaps up to 1 inch to 3 inch.

They can be mounted single handedly without the use of any complicated tools or hacks.