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2" Coupler with Stop
Copper coupler with stop for joining 1/2" (.625" actual OD) plumbing tube.  Often used to assemble sections of drain tubing from a still condenser in order to keep the collection point safely away from the still if you are using any open flame as a heat source. Copper coupler with stop for joining 1.5" (1.625" actual OD) plumbing tube.  Often used in still columns so they can be disassembled in sections for cleaning and storage.  This is accomplished by soldering the coupler to the lower section of tubing and just sliding in the top section.  The top joint can be sealed using our unique sealing sleeves sold in the gasket section of our site. Copper coupler with stop for joining 2" (2.125" actual OD) plumbing tube.  Often used in still columns so they can be disassembled in sections for cleaning and storage.  This is accomplished by soldering the coupler to the lower section of tubing and just sliding in the top section. The top joint can be sealed using our unique sealing sleeves sold elsewhere on our site.
2" Coupler with No Stop 3" Coupling with Stop
Copper coupler with no stop for joining 2" (2.125" actual OD) plumbing tube.  Often used in still columns so they can be disassembled in sections for cleaning and storage.  This is accomplished by soldering the coupler to the lower section of tubing and just sliding in the top section. Not having a stop allows you to shorten the insertion distance of the lower tube section increasing the insertion of the upper tube for greater stability. The top joint can be sealed using our unique sealing sleeves sold elsewhere on our site. Copper coupler with stop for joining 3" (3.125" actual OD) plumbing tube.  Often used in still columns so they can be disassembled in sections for cleaning and storage.  This is accomplished by soldering the coupler to the lower section of tubing and just sliding in the top section.  The top joint can be sealed using our unique sealing sleeves sold in the gasket section of our site.