On the first compression test that checked the 4th cylinder on a Mercruiser 3.0L, the hose burst at 150psi+- at the connection point with adapters. Not sure if this product can handle the 300psi listed. I would recommend buying products that have separate hoses from ATTACHED adapters as this product will disconnect from the attached adapter if removed after testing and you will have to "fish out" the adapter. The 3.0-liter Mercruiser motor didn't have enough clearance to remove it with a socket, so you had to use needlenose pliers to pull the end out.
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