Graham
I've just looked up "Zerk" on Wikipedia.
Named after the inventor Oscar U Zerk!! (Honestly)
Apparently the fitting allows a more angled approach to the grease nipple!
I know we shouldn't poke fun at people's names, but that's a cracker.
Bud
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2003 - 4/4
Grease fittings are rarely found on today's consumer goods, appliances, or cars, because maintenance-free products have more sales appeal to the general public.
Morgan?