Check valve works but not perfect. The seat that the ball bearing sits on is not polished and therefore has little reflux. Also, the hose was shorter than advertised, maybe only 18 inches. Really too short to be practical, I would have planned to buy a clearer tube to make this work.
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Universal Car Ratcheting Caliper Piston Tool with 2 Steel Plates - Brake Caliper Press (Red, Two Size)
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