Worcester Greenstar Heatslave 18/25 (Diverter valve)

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11 Jan 2026
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Cornwall
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United Kingdom
Anyone know if this diverter valve is the type with fiber or rubber o'rings - I don't want to buy the wrong one ! I think there are two versions

The boiler was installed in 2010 (Worcester Bosch Greenstar Heatslave 18/25 external oil)

The motor head is Diverter Valve 8-718-684-238

Oh yes, Do I need add/replace inhibitor Fernox ? when the pressure system is drained a bit ?

Thanks.
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