http://www.siouxchief.com/B_Products_Prods.cfm?ID=35
Sioux Chief "mini rester". Were in the water heater hookup area at home depot and near the washing machine hose hookup area at my lowes.
http://www.siouxchief.com/PDF/MiniResterbrochure04.PDF
I've been told that these spring loaded variety do 'wear out' after a while, particularly if you have a lot of valves opening and closing abruptly and regular hammer problems. Best thing to do if you have a real problem with this (aside from replacing the valves causing the problems) is to pick a high spot in the attic where your pipes run, cut into the hot and cold and solder in a tee facing up, then solder in 18" of pipe and cap it. The air trapped in that pipe will become a fully effective hammer arrestor. Occasionally the pipe may become waterlogged, in which case draining the system fully restores the arrestor function.
But these sure are a lot easier to do...
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