or they can be purchased from COV here
I also bought a couple of "slap yo' momma" tank filler/sealers from Big Daddy Vapor
Slap Yo' Mama Multi-Purpose Adapter [SLAPMOMMA1] - $12.99 : Big Daddy Vapor
If you can make it through the hillbilly video they demonstrate their use.
How To Videos : Big Daddy Vapor
Just some options for you Sun