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I have tested many Chinese disas. The quality of it will highly depend on who you purchased it from and what supplier they got the valve from. Some of them are much slower than an OEM valve, to actuate, others the shafts are shorter than OEM internally (leading to higher chance of movement inside the flap and higher risk of breaking) and some will have boards failing to actuate the valve at all after a while. Also rubber seals are usually lower quality.
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