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Sliding Tee Printable version

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A fixture mounting device for sidearms that adapts, at a right angle, the 1/2" schedule 40 (or sched. 80) pipe of a sidearm to the 1/2-13 mounting stud of a theatrical fixture.

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http://www.bhphotovideo.com/c/product/389076-REG/Altman_TEE_Sliding_Tee_Cast_Iron.html