Aluminium, fine turned finish.- Version OS: plain.- Version AS: plugs with laser engraved graphic symbol "drain", according to DIN regulations.- Version ES: plugs with laser engraved graphic symbol "fill", according to DIN regulations.
NBR synthetic rubber.
- Plugs with Ø 2 mm (d2) side breather hole (Execution 2 with vent drilling).
GN 741 plugs are provided with a threaded blind hole for assembling a dipstick.
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