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A stroke refers to a piston traveling through a cylinder. If it travels up and then down, thats one turn of the crankshaft and is “two” strokes. If it travels up and down twice that’s two turns of the crankshaft which is four strokes. Hence 2 cycle and 4 cycle. Don’t know how you can get to a...

Correct on everything you stated. Also a shut in or deadheaded centrifugal pump will let you know there is a problem because the heat build up will destroy the seals pretty quick as well as the motor will fail running under no load.

If you just are anywhere close to N. Louisiana give me a shout. I bought a bunch last year. All good construction steel. Am selling for: 2” (2-3/8” od), 4000’ @ $1.25 a ft 1-1/2” (1-7/8” od), 6000’ @ $1.00 per ft 1” (1-3/16 od), 4000’ @ $0.75 per ft If the democrats stay in power much longer...

They are great for certain applications, mostly refrig work, sweating copper tubing and fittings. If you try cutting steel with a #2 tip the small oxygen cylinder will last about 30 minutes.