L.G. Arpin Company Divair 1956 #2715

L.G. Arpin Company and the DivAir Demand Regulator: A Pioneering Force in Early American Scuba Gear

The L.G. Arpin Company, founded by Bill Arpin and Paul Arnold in West Caldwell, New Jersey, played a pivotal role in shaping early American scuba diving technology. In 1954, they introduced the DivAir—a double-hose demand regulator that offered a fresh alternative to European imports.

Origins and Innovation

Unlike the popular twin-hose regulators designed in France, the DivAir used a single-stage, upstream push-to-open diaphragm system. The regulator also featured an integrated reserve system, allowing divers to switch to a reserve air supply during their dive without surfacing. This innovation marked a significant departure from its European counterparts and gave American divers a homegrown option for underwater exploration.

Model Evolution and Technical Improvements

Between 1954 and 1956, the L.G. Arpin Company launched several improved versions of the DivAir:

• Model A (1954):
  The first DivAir model used a nickel-plated bronze body and repurposed WWII surplus gas mask hoses. It included a push-twist reserve button and weighed approximately 1.3 kg. The company produced about 2,000 units before moving on to refinements.

• Model B (1954):
  Engineers redesigned the reserve mechanism into a hexagonal button and introduced the AIR-FLO hose system. The label also changed to a distinctive blue. Only 500 units of this version were manufactured.

• Model C (1955):
  To reduce weight, the company switched to anodized aluminum, which brought the regulator’s weight down to about 800 grams. Additionally, this model featured redesigned intake and exhaust horns, as well as check valves relocated to the ends of the hoses. Approximately 6,200 units entered the market.

• Models E and F (1956):
  These later models used high-impact plastic, shaving the weight further to around 680 grams. Model F improved the diaphragm and increased the hose size, enhancing breathing performance. In total, 7,000 units of Models E and F were released.

Naval Interest and Evaluation

In 1956, the U.S. Navy Experimental Diving Unit tested a modified DivAir regulator for military application. The trials, which included depth tests down to 132 feet, verified the regulator’s robustness and suitability for service. As a result, the DivAir gained official interest, although the military ultimately adopted newer designs in the following years.

Decline and Legacy

By 1957, competition increased as Healthways introduced the SCUBA regulator, developed by Sam Lecocq. This advancement eventually led L.G. Arpin Company to phase out the DivAir line. The company sold its remaining inventory to Unity Service in Jersey City, which supported divers until parts ran out.

Today, DivAir regulators are highly collectible. Vintage scuba enthusiasts often restore them using handmade or custom-fabricated components, such as hoses and diaphragms. Forums like ScubaBoard and collections like CG-45.com offer valuable insight into these rare pieces of diving history.

Final Thoughts

While the DivAir’s commercial lifespan was short, its impact on American diving innovation was profound. Through its progressive design changes and early adoption by both recreational and professional divers, the DivAir helped set the stage for modern regulator development.

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