this HAYWARD pressure reducing control valve can apply back pressure to a metering pump to help prevent siphoning and eliminate variable dosage rates due to a fluctuating downstream pressure

Speakman CPT-5400 Thermostatic Pressure Balance Diverter Shower Valve Trim

Standards UL Recognized (E48412)

Rim Height: 15 3/8 in

American Standard Aerated Outlet, Fits Brand American Standard, Chrome, Brass - 078481-0020A Height-17" this HAYWARD pressure reducing controlAerated Outlet; Faucet Part Type: Aerated Outlets; Fits Brand: American Standard; Finish: Chrome; Flow Outlet Type: Aerated; Flow Rate: 2. 2 gpm; Includes: Aerator, Key; Material of Construction: Brass; Package Quantity: 1; Thread Size: 15 16"; Thread Size Type: Male