My 5lt Hozelock sprayer blows the relief valve at around 30psi. I think you will struggle with 40-50psi as that pressure isn't needed or desirable for the sprayer to do that which it was designed for.
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2001 V40 2.0lt Sport lux - Daily Driver. 174k miles.
2003 C70 2.4 GT Convertible - Garage Queen. 65k miles.
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