https://www.aliexpress.com/item/1005003221596158.html?spm=a2g0o.order_detail.order_detail_item.3.4116f19cAVilwR
Those are high temperature o-rings. I ordered the 14, 15 and 16mm (OD, outer diameter) o-rings. The 16mm ones fit the best.
Lots of salty folks in this thread about the price.
This is a premium product, premium made. I don't think it tries to be the "best value", just "best".
Anyway, new price is less expensive than a Staroma XL kit and that one is made in Malaysia.
I vape less than 10g/6 months and I still consider myself as someone who vapes cannabis. I just do one or two bowls a week. Cannabis is laughably cheap when 0.2g sends you to the moon.