faucet O ring material

[Fritz57]

tired of paying $illy $ for hansgrohe faucet stems (94009000) that just need a new 14x2.5mm O ring.
What should replacement O rings be made of?
Or better still, a link to where I can buy the right one.

 

[Geofd]

Hansgrohe (uk) has them

 

[sawsaw]

tired of paying $illy $ for hansgrohe faucet stems (94009000) that just need a new 14x2.5mm O ring.
What should replacement O rings be made of?
Or better still, a link to where I can buy the right one.

Try the big box stores.