Double Walled BTE Tubing?

@nc2kids

If ya only looking at one place, can you search for it as you know where you want to buy from?

Are thick walled PVC tubing considered double walled? I found one in Aliexpress, but I am not sure if this thick one is considered double walled. https://www.aliexpress.com/item/32977960549.html?spm=a2g0o.store_pc_groupList.8148356.2.598347588FfRiW&pdp_npi=2%40dis!JPY!￥%2089!￥%2080!￥%2080!!!!%402100bb4c16634005801334851e7ee6!12000015920369079!sh9

Not sure where my A.uD gets these, TBH? She just gives me a pack as and when required… Cheers Kev

@nc2kids

They have to be marked a thickwall, double thickwall etc.