Marchesini VU MM in-line check valve, male-male, 1/4" to 2", with a 1, 3 or 6 bar spring.
The VU MM is Marchesini's in-line check valve with G male threads on both ends, to fit straight into a female port without an adapter. It lets oil through in one direction and blocks the opposite one.
The number after the slash is the cracking pressure: /1 opens at 1 bar (the standard spring), /3 at 3 bar and /6 at 6 bar.
Check the thread and the flow direction before fitting.
Source: Oleodinamica Marchesini general catalogue 2018.
Data sheet
Specific References
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