You could always make some bodge onto to a track pump or any pump with a pressure gauge and see what that comes out with. Then run the hot water tap in the sink to seeif the pressure still holds while the water is running.
@O'Shane started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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You could always make some bodge onto to a track pump or any pump with a pressure gauge and see what that comes out with. Then run the hot water tap in the sink to seeif the pressure still holds while the water is running.