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1/4" threaded elbow plug x 1/4" for tubing.
Used in under-sink water treatment systems, including reverse osmosis systems. The A4SE4-W elbow is equipped with a quick-connect mechanism - attaching the hose involves pushing it firmly into the fitting, without the need for additional tightening or sealing with Teflon tape. The fitting with a self-sealing mechanism is commonly referred to as a "quick connector".
The A4SE4-W elbow is installed in most water filtration systems available on the market (e.g., in reverse osmosis filters, under-sink filters, etc., which have a built-in "QC" quick connector in their cartridges).