I had concerns about them for a long time, but when I saw some silicone radiator hoses for half the price of SAMCO hoses, I went ahead and bought them figuring silicone is silicone. Well, I was half right. Turns out the minute gap between the ring of my radiator and the hose itself leaked some antifreeze no matter how tight I tightened the clamps. The hose on the bottom actually popped off two times on me and with two clamps, it still popped off under load. These hoses were pretty bad and I would never use them again. I probably wouldn't buy any of their products due to that as well.