NBE compression couplers use a wrap-around compression design to enable secure assembly of dry materials conveying equipment. Constructed of zinc-plated steel, the NBE compression coupler with white neoprene gasket is an excellent method for joining pneumatic bulk solids handling equipment. National Bulk Equipment compression fittings are available in lengths from 4 to 8 inches, and O.D.s from 1.5 to 6.625 inches.