The Arnie“. Seiko H558-5009. The Seiko H558-5009 was the first dive watch to feature a digital alarm chronograph with combination analog display.. Its nickname came about because it was a favourite watch of Arnold Schwarzenegger and he wore it in “Commando”(1985) and “Predator”(1987. Pool Valves and Plumbing Confusing? In a pool plumbing system, there are pipes that bring water from the pool (suction pipes), and one or more pipes that take water back to the pool (return pipes.