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There are many accessories that are required for pressure gauges. Some of them include pressure snubbers, siphons, throttling devices, needle valves and so much more.
By reading and following manufacturers directions of course
Safety valves are required on all closed pressure vessels.
Most single lever valves are pressure balanced between the hot and cold. Unequal pressure will result in low pressure.
The 2001 BMW 7-Series has 32 valves.
The 2008 BMW 7-Series has 32 valves.
The 2004 BMW 6-Series has 32 valves.
The 2013 BMW 6-Series has 24 valves.
The 2011 BMW 3-Series has 24 valves.
The 2001 BMW 5-Series has 24 valves.
The 2007 BMW 3-Series has 24 valves.
The 2009 BMW 6-Series has 32 valves.