The 6″ Silicone Membrane stick is shipped with the end plug out of the hole to fit in the box.
When it is time to assemble put the plug in the end of the tube that is the deepest. The short end is where to hook up the air line. Simply look into the tube and you will see a short distance of a longer distance. The short distance is for the air inlet and it is 1/2 national pipe thread.
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Darrell Rhoades is the founder of Whatpond.com. A one man business, works full time in tool & die. It all started when he built his own pond for the family. Ran into pond issues and started the research with pond suppliers and conferences for pond management. He writes about pond building and pond management and sells pond management supplies, aeration & fountains and Practical hands on experiences at Whatpond.com. . No physical store, but has items in stock.
Certified Fountain & Aeration Repair