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Attwood Marine SL13-20-5 Gas Springs Ni-Slide Series Attwood gas springs are made with bio-degradable no hazzard to water grade oil (WGK), making them the marine industry's most environmentlly friendly gas springs. All springs pass ASTM B117, Attwood salt spray and a 30,000 cycle lifecycle test. Attwood gas springs come has many configurations to fit your needs including: marine, industrial, agric…