Essentially all latex tubes have removeable cores, most butyl don't. This is very rarely noted in the product description, largely because the vast majority of sellers don't manufacture their own tubes and want to leave room to change suppliers without need to relabel. This is a good LBS purchase (because you can actually check), although some online sellers will note the valve stem type.

It's been a long time since I had to purchase a tube, so can't offer any current recommendations, sorry!

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Tech writer/support on this here site. FIST school instructor and certified bike fitter. Formerly at Diamondback Bikes, LeMond Fitness, FSA, TiCycles, etc.
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I guess I’m really looking for where I can screw off the whole top put on the extender and then through the top back on the top of the extender… Does that make sense?

My LBS carries Bontrager tubes and they have removable cores. Yes, you remove the 'top', screw the extender in it's place and put the 'top' at the other end of the extender.

Ok. Looks like a field trip tomorrow.

Thx

Yup, that's a removable core type. A good LBS should definitely be able to help you out with this.

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Tech writer/support on this here site. FIST school instructor and certified bike fitter. Formerly at Diamondback Bikes, LeMond Fitness, FSA, TiCycles, etc.
Coaching and bike fit - http://source-e.net/ Cyclocross blog - https://crosssports.net/ BJJ instruction - https://ballardbjj.com/

You don't need to move the valve core to the end of the extender.

So they just keep the air in without it?

Seemed pretty clear that the OP description was of the type of extender that does, yes, require this. Perhaps it is worth mentioning that there are other types that don't, but...

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Tech writer/support on this here site. FIST school instructor and certified bike fitter. Formerly at Diamondback Bikes, LeMond Fitness, FSA, TiCycles, etc.
Coaching and bike fit - http://source-e.net/ Cyclocross blog - https://crosssports.net/ BJJ instruction - https://ballardbjj.com/

Leave the valve core in the tube's valve.

Add a basic extender like this:

https://www.ebay.com/...d=706-127636-26712-0