Combination connector used for thru-roof air terminal penetration — draws tight to top and bottom of composition or metal roof surfaces. Neoprene washers are included to provide a moisture seal. Point adapter nut No. 803 or No. A803 at top. Your choice of No. 42A or No. A42A tee connector or No. 55D or No. A55D clamp for bottom end (either fits all main cables through 9/16” diameter). For copper-to-copper connection, all components are copper or bronze except nuts and washers which are stainless steel — for copper-to-aluminum or aluminum-to-aluminum connection, the threaded rod, nuts and washers are stainless steel. Threaded rod 1/2” diameter, standard length 24” — other lengths available upon request.