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.
An o-ring is one of the most common types of seals in the world. Due to this popularity and the vast array of applications in which o-rings are used, there is a virtually unlimited number of possible sizes of an o-ring. Thus, the need for size standards which cover the most common sizes used across various industries and geographic regions.