Here's another possibility- - - - -put the joint at the top so the seal prevents a seep leak at the bottom. 6MM or maybe 8MM should be about right. 1 meter (3 feet) should be a lifetime supply.

www.ebay.com/itm/144002221038?

Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!