Salamander 22mm top entry compression fitting S-Flange. The Salamander S-flange encourages aeration to follow a natural path to the vent and prevents aerated supply water being drawn into the pump. Further Information: Plumbing is not an exact science and aeration of the supply water to showers and other outlets is a common problem. When a pump is fitted to boost the supplies from the cold water storage tank and from the cylinder to showers, baths and basins the risk of aeration is increased many times.
Less Aeration meaning
Unnecessary, perhaps sudden temperature fluctuation at the shower or other outlets
A noisy pump
Accelerated degradation of the pump's mechanical shaft seals eventually to leak
Premature pump breakdown
Correctly fitted Approved cylinder flange will mitigate if not prevent these risks