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Use these insert fittings for repairing, adapting or connecting black poly tubing (see Index). Connections under stress or pressure will require hose clamps (see Index). These insert fittings fit the nominal sizes of polyethylene tubing; for instance, a 5/8” fitting fits tubing with 0.62” I.D. Use letter following part no. to indicate size (A=5/8”, B=3/4”, C=1”, D=11/4”, E=11/2”, F=2”).