Johnson vacuum valve 22 mmThe vacuum valve is an inexpensive insurance against water ingress into the engine and associated expensive repairs. The maximum ambient temperature should not exceed 60°C.The valve opens at a pressure equivalent to a water column of 3-5 cm. The materials used are seawater resistant and suitable for use with fresh water and glycol at typical concentrations. The valve should not be exposed to oils and greases and should be cleaned or replaced immediately if contaminated.- Non-corrosive- Easy to install- Does not leak- High quality plastics- 5 valve sizes.
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