I see there're three types of water hammer arrestor on the market, but which is most effective - and does it need more regular maintenance?
There's the sealed off type with a small diameter piston and an air cushion:
There's the broader squat type with a piston and spring in it (to my mind, more likely to rock about laterally and pass water by the seal):
Or there's the type with a diaphragm and is re-pressurisable when/if so required:
But type is least hassle/works best?
Nozzle
There's the sealed off type with a small diameter piston and an air cushion:
There's the broader squat type with a piston and spring in it (to my mind, more likely to rock about laterally and pass water by the seal):
Or there's the type with a diaphragm and is re-pressurisable when/if so required:
But type is least hassle/works best?
Nozzle