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Indiana State Pipe TradesAssociationMaintaining the Tradition ofExcellence. Weve Helped Workers and Employers Improve the Industry Indiana State Pipe TradesAssociationMaintaining the Tradition of Excellence. Weve Helped Workers and Employers Improve the Industry The Indiana State Pipe Trades Association is proud of the role we play in providing good jobs and a secure future for our members. These good jobs pay a living wage that supports families pays taxes and contributes to a strong economy.