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GROCO (Gross Mechanical Labs), a marine hardware manufacturer operating out of Maryland since 1918, gives Jon from the boat *Antidote* a factory tour led by VP Dan.2:05 The company makes seacocks, strainers, valves, and fittings — all 100% American-made for its core product lines, with raw castings sourced from a Pennsylvania foundry the company has used for 80 years and a recently acquired New Jersey foundry added to meet post-COVID demand.14:04

Dan traces GROCO's history from early automobile tail lights and snowball-machine patents through World War II, when the company supplied duplex strainers for Higgins landing craft at Normandy and oil coolers for tanks.5:13 The duplex strainer design — allowing crews to switch filter chambers and clear sand without stopping engines — is credited with saving lives during beach landings.5:43

The tour covers the full production floor: a 1921 multi-spindle drill press still capable of running today, 1990s CNC lathes, 2016 twin-spindle twin-turret lathes with robotic loading arms that lifted daily strainer-head output from 40 to 220 pieces, and a horizontal mill that completes a five-operation duplex strainer in 45 minutes versus the six weeks required through sequential older machines.19:45 Every fitting, regardless of batch size, receives 100% hands-on inspection and pressure testing before shipping.10:45

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