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Old 10th November 2014, 10:38 AM
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sven sven is offline
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Join Date: Dec 2009
Member of: FT Schalkhaar / SSV Ons Genoegen
Location: Arnhem, The Netherlands
Posts: 233

The problem most probably has to do with the material that this black seal is made of (Delrin??/POM??). It is much harder and less flexible than PTFE / Teflon. When the reg has compressed the black seal for a long time the reg+valve seal will be "dented" by the pressure of the reg bolts.
The original Walther seals for the LG300 Dominator are white PTFE.

The newer Walther LG400 has a black Delrin/POM valve seat but has an o-ring on top to seal the reg. Best of both worlds. A hard valve seal and a soft reg seal.
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