Grease for diverter valve diaphragm

[MattJ2000]

Hello,

I'm looking into a small leak on my combi boiler diverter valve. Combi boiler Biasi Garda M90F 32S. Stripping and greasing the parts in the diverter valve was recommended to me as a way forward.
Can anyone tell me what grease I should use on the diaphragm?
Of course it's a Sunday and it seems that Halfords, B+Q and screwfix are my only options. I was thinking of going for WD-40 Specialist High Performance White Lithium Grease.
Will this be okay to use?

Thanks in advance

Matt

 

[Madrab]

Ideally you would use a silicone based grease.

 

[Terry lambert]

Edit

 

[45yearsagasman]

Most diverters require new seals when they leak. It's the push rods that need greasing and not the diaphragm. As said, silicone grease should be used. You could give cleaning and greasing the push rods a go, but more often than not the seal has worn.

 

[flameport]

This stuff if you want to have a go at it today:
http://www.toolstation.com/shop/p34053