Nautical Antiques & Marine Art at Land and Sea Collection™ Dive Helmets, Ship Models, Sextants

Schrader Two Diver Deep Water Navy Style Air Pump

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Schrader Two Diver Deep Water Navy Air Pump

SCHRADER TWO DIVER
DOUBLE ACTION HAND CRANKED DEEP WATER AIR PUMP

Front of Schrader two diver, dive pump showing gages image

                                                          

Overall Dimension of case 40.5” H x 33” W x 18.5” D    Diameter of wheels  50“ Dia 
Bore - approx 3 1/4"   
Estimated Weight 200 lbs       Markings. See below
                                                                                              

Presented is a rare example of a deep water, two diver air pump from a design dating back to 1898, that was made by A. Schrader's Son, New York. It is in pristine working condition.

This Air Pump design was the standard for the US Navy for many years. Capable of handling 2 divers working simultaneously down to 100 ft., or one diver only in very deep water. It has 2 cylinders, double action, with Two Patent indicating gauges to denote the air pressure and depth of each diver. With a copper water cistern, 2 flywheels, in a solid Ash Chest, with iron rings for lashing down the pump or transporting.

Unit has the original wrench for removing the crank handles and brass securing nuts for the fly wheels. These wrenches are almost impossible to find, today.

PROVENANCE: From the private collection of a Master commercial diver with 47 years experience in the water and as a marine consultant. This pump was found in a warehouse in the Great Lakes area where it had been sitting for the past 40 years. 

The pump is being sold for display only and should be sent to a dive shop for re certification if intended for use.
 

Partial rightside view of Schrader diver air pump image

Front view of Schrader two diver air pump image

Dimensional side views of Schrader air pump

CONDITION: The pump had a thick layer of marine soot and oil covering all the internal parts. It smelled of hydrocarbons so badly that it could not be kept inside. It was professionally cleaned by Nautilus Worxs, Inc. of Houston, TX. Each and every part was dismantled and hand washed with mild soap and water to preserve the beautiful patina found under the black layer of soot and oil. It now is an easy to crank unit. One person can crank the pump and 4 revolutions of the handle will bring it to full working pressure. 

Schrader dive pump maker's name plate image

Gauges on Schrader two diver air pump image

                Maker's name plate: A. Schrader's Son, New York USA & two gauges

FEATURES: This Schrader pump, two diver air pump was designed in 1898, and is housed in a hardwood chest with iron tie down rings, and two large iron flywheels. It is fully restored and fitted with two flywheels, and iron angles at all four corners. It features a twin double acting cylinder with valves that could be serviced without removing the pump from its chest. There is a water jacket around the cylinder to cool the air that was pumped to the diver. A special reservoir on the lower beam acts as an air chamber collecting surplus oil and cause the air to flow steadily and remain free of contaminants. Two large gauges on the front indicate air pressure and the depth of water where the diver is working.

HISTORY OF SCHRADER DIVING: Schrader is one of the oldest names in U.S. diving, second only to Morse. The founder, August Schrader was a creative and inventive German immigrant who originally set up a shop dealing in rubber products in New York City, NY  in 1839, only a few years after A.J. Morse set up shop in Boston .

In 1845 he began supplying fittings and valves for rubber products made by the Goodyear Brothers. Schrader was also a maker of daguerreotype apparatus. His original shop was at 115 John Street in Manhattan,  NY . Shortly thereafter he went into partnership with Christian Baecher. Christian was a brass turner and finisher which provided a foundation for what followed.

The two partners, having watched divers at work at a nearby New York Harbor jetty, decided to improve the diving helmets in use at the time. In 1849, with the help of Baecher, he created a new copper helmet. Later his interest in diving led to him to design an air pump.

Around 1890, August Schrader saw the need for a bicycle tire valve. By 1891, he produced the Schrader valve. The Schrader valve was his most popular invention, and is still used today.

In 1917, the United States Bureau of Construction & Repair introduced the MK V helmet and dress, which then became the standard for US Navy diving until the introduction of the MK 12 in the late nineteen seventies. Schrader and Morse Diving were the two original suppliers.

A great addition to a dive collection or, put back in service after inspection by a certified dive shop. 

Schrader dive pump switch image

Showing cylindar head image

Showing twin cylinder heads image
Two diver switch, crank shaft, twin cylinders of Schrader dive pump

Tops of cylinder heads image
Various cover plates on the Schrader dive pump

LOCATION: Louisiana

OUR UNCONDITIONAL NO NONSENSE GUARANTEE: We are acting as a broker in this transaction and are representing both the buyer and seller. We have not independently inspected this pump. The seller is an established person with a long history in the diving industry and my record of honest dealing is well known.  If not completely satisfied with your purchase it may be returned, if without damage, within five days of receipt in its original packaging and at your expense. Return items must be insured for their full value. Only a prior email authorization by us for the return is required. Shipping charges are not included in this offer. 

STANDARD FORMS OF PAYMENT are Bank wire transfer, cashier's check, money order, or personal check in which case the item will be held until cleared. Our prices are quoted net to us so that the use of credit cards or PayPal incur extra charges. Terms on overseas sales are different. 

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