N.A.T.O. The defensive military alliance formed in 1949 by ten european countries. WARSAW PACT A military alliance formed in 1955 by the Soviet Union Netherlands. Norway.
Tank Rings. Tank rings filled with gravel lift the tank above the surrounding grade. This keeps the tank out of standing water and increases the life of the tank bottom.
O-rings are common seals used in many manufacturing industries. Because of their cost, simple production, easy installation and pressure resistance, they have found their way into a lot of common products, such as automobiles and engines. EPR o-rings work well with Skydrol and other hydraulic fluids, as well as steam, water, silicone oils, brake fluids and alcohols. 2  Deficiencies: Similar to nitrile, EPR is not perfect for a wide-range of applications due to wear and tear issues.