SAE unions and tubing nuts and flares are double flares. Metric unions, tubing nuts and flares are bubble flares.
On old American iron, I use SAE and double flares. On new American iron, and Mercedes I use bubble flares. SAE stuff. https://www.amazon.com/AGS-Steel-Tube-16-24-BLF11B/dp/B00U1MVUN8/ref=sr_1_5?ie=UTF8&qid=1476992693&sr=8-5&keywords=double+flare+nuts+and+unions https://www.amazon.com/Inverted-Flare-Brake-Union-threads/dp/B01KNGVB6W/ref=sr_1_3?ie=UTF8&qid=1476992832&sr=8-3&keywords=Inverted+Flare+Union Metric stuff. https://www.amazon.com/Bubble-Flare-Metric-Thread-276010/dp/B004QS2ZDW/ref=sr_1_2?ie=UTF8&qid=1476992925&sr=8-2&keywords=bubble+flare+nut https://www.amazon.com/Bubble-Flare-Brake-Union-276000/dp/B006HI66XY/ref=sr_1_2?ie=UTF8&qid=1476992862&sr=8-2&keywords=bubble+flare+union Both work with 3/16" (5mm) lines. This is the tool I use, and it rocks. https://www.amazon.com/Eastwood-25304-Professional-Tubing-Flaring/dp/B002QBRHD4/ref=sr_1_1?ie=UTF8&qid=1476993131&sr=8-1&keywords=eastwood+flare+tool Rick _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com