Soft compound o-ring - fits non return valve or anti-vac valve

Recommended for the non return valve on all londinium machines that have a manifold, and the anti-vacuum valve on all londinium machines

If you are currently experiencing a loss of pressure through the non return valve changing to these o-rings will improve the life of the pump and stop the pump barking (LR), or blipping (R24), repeatedly

Fitment of this o-ring to the anti vacuum valve will increase your boiler cycle significantly, reducing energy consumption and wear on items like the Sirai pressure switch

Additionally the reduction in pressure losses in the circuit is likely to allow you to reduce the setting of the expansion valve by around 2 bar, say from 12.5 bar to 10.5 bar, which reduces the load on the system and should improve the life of the seals and may improve the consistency of the espresso further as there will be less turbulence when the shot is pulled

This part is standard issue for R24 and Compressa built after 1 January 2021

You could also be losing pressure through old piston seals, a solenoid with a tiny piece of grit in it, the expansion valve (unlikely), or the mechanical pressure switch for LR that have not had the digital pressure transducer fitted

If you want a significant upgrade to your machine for a nominal outlay, this is it