Rare diver vintage device leak tester USSR army RKU-2. Tightness of the cavity of high pressure. Tightness of the cavity of low pressure. Resistance to inhalation and exhalation. Setting pressure of the reducer. Opening the safety valve. Tightness of the valve of the lung. If You have any questions. Europe and Asia 10-20 days. US and Canada 20-40 days. Add a map to your own listings. View more great items. The item “Rare diver vintage device leak tester USSR army RKU-2″ is in sale since Saturday, January 27, 2018. This item is in the category “Collectibles\Transportation\Boats & Ships\Military\Other Naval Collectibles”. The seller is “oldschool-by” and is located in Minsk. This item can be shipped worldwide.