Reg core delrin seal

[angrybear]

Just found a spare reg core that has no white delrin to seal against the push pin, It had just been screwed in super tight     
So just wondering is it a special spec (if so what) or only white to be visible ??
Ta.

[Ca_Varminter]

No...
I have use white and black Delrin(Acetal)
but I have also used PEEK...

Stuart

[Squinty]

White delrin is used because it's harder than black.
PEEK is harder, I'd guess RAW use it because it stands up better to higher reg pressures and 250 bar fills

[angrybear]

Cheers all, best look for some Peek on the bay