The Midbrass Water Hammer Arrestor is an effective way to stop banging pipes when valves or outlets are closed suddenly. It is very simply fitted as it attaches directly onto washing machine valves with its 3/4"M-3/4"F compression fittings. This can also be easily adapted elsewhere in the home. Installed within 1.5m of the problem source, the issue of banging pipes will be resolved, providing continual protection from water hammer or pulsing damage. Install instructions Can be fitted vertically or horizontally. Fit female hose thread onto your washing machine shut-off valves. Install washing machine supply hose onto the male thread outlet of water hammer arrestor. Hand tighten connections and use a wrench to tighten an extra 1/4 turn. Do not overtighten. Important:- A pressure reducing valve should be installed before the hammer arrestor for any systems exceeding 60psi (4 Bar) pressure. For installations with excessive water hammer, 2 or more units may be fitted inline.