Kavan tank extenders

I noticed in the forum a mention of the above mentioned Kavan tank extenders for Black Widows and such.Where can a guy get some of these?
Thanks,
Larry Lundy

by any act, error, or omission, I have, intentionally or
unintentionally, displayed any breedist, disciplinist, sexist, racist,
culturalist, nationalist, regionalist, localist, ageist, lookist, ableist,
sizeist, speciesist, intellectualist, socioeconomicist, ethnocentrist,
phallocentrist, heteropatriarchalist, or other violation of the rules of
political correctness, known or unknown, I am not sorry and I encourage you
to get over it.

I used to get mine from Hobby Lobby.

Thanx, I'll give it a shot.
Larry

Hello I have a Kavan tank extender for a Black Widow new in package.
Email me direct if interested.Thanks