I had a leak in my Seastar steering at 1 of the rear cylinder seals. I ordered the seals from Seastar and also ordered the crossover tube for bleeding the system. After 3 attempts to get all of the air out of the system I called tech support at Seastar. Before I could finish telling the technician my problem he asked if I had used the crossover tube which I told him that I had. He said that the crossover tube is not the correct way to bleed the system and it creates small bubbles that turn into large air bubbles. I bled the system the old way 1 side at a time and now the problem is solved. I know the crossover tube works for some but not for me. Good luck.