The extension coupling comes with the extension kit but I do not believe it is sold separately.
As an alternative you could get a 1/2" insert x insert connector at any hardware store and a couple of stainless steel worm clamps and make your own. It will be a lot more secure than the Aqueon extension coupler but will be more difficult to separate if you need to.
Andy
link so i know what that is?The extension coupling comes with the extension kit but I do not believe it is sold separately.
As an alternative you could get a 1/2" insert x insert connector at any hardware store and a couple of stainless steel worm clamps and make your own. It will be a lot more secure than the Aqueon extension coupler but will be more difficult to separate if you need to.
Andy