Mann Hummel part no for the check valve is 2400843621.
That will works with Pro Vents 100/150/200.
Here is the catalog if anyone else wants it.
https://www.mannfiltersrus.com/pub/m...ilation_EN.pdf
Now I have more questions, it appears that you only need the check valve if you are draining back above the oil level.....?
Quote:
Oil return The respective port of the oil return (see diagram on page 15) is connected to the oil sump via a drainage pipe. There are two principal connection possibilities:
1. Below the oil level The oil return is connectedvia a drainage pipe below the minimum permissible oil level of the engine oil sump. According to the principle of connected pipes, the same oil level is present in the oil sump and the drainage pipe. This oil receiver acts like a siphon so that when the oil is sucked from the outlet port the blow-by is directed via the oil separator. The negative pressure in the oil return pipe during operation is the same as the negative pressure at the oil separator. As opposed to conventional solutions, this intake negative pressure is reduced due to design considerations so that the height of the oil column in the drainage pipe during operation is accordingly low. As a result the drainage pipe need only take into account a respectively low oil column and this enables numerous installation possibilities.
2. Above the oil level This connection variation requires fitting of a check valve which is available as an option. The valve is fitted in the drainage pipe is close to the engine as possible. Separated oil collects above the check valve during operation. The check valve is closed during operation by the negative suction pressure present in the housing of the ProVent. When the weight of the oil column is above the closing pressure of the valve, for example when the engine has been switched off, the separated oil flows back to the oil sump.
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If we plumb the Pro Vent as Mark described in the clean side, between the air intake and the dry sump tank, which way is the air flowing? Normal operation, fresh air flows through the air filter, past the MAF, into a hose through the Pro Vent and into the tank. No need for an air oil separator in situation.
Under heavy load, that air flow reverses, out of the tank into the Pro Vent up the hose and into the intake tube. We don't want oil there at all.
Do we follow the arrows on the pro vent for for the former or the latter?
This may become painfully obvious when I hold it in my hand.
Thanks again!