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It is available in two thread sizes: 1/2" bsp, which requires a 21mm hole. 3/4" bsp, which necessitates a 26mm hole. This extender can be easily screwed into existing threads if your container already has a female thread or if there is no pre-existing thread, you can create a hole and directly affix the device onto the barrel.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.