Heavy-duty manual coupler works with ¼ in body industrial interchange plugs/nipples. It includes 2 piece 3003 ¼ in coupler body x ¼ in female NPT, 2 piece 3103 ¼ in Coupler Body x ¼ in male NPT, 6 piece 10-3 ¼ in plug body x ¼ in male NPT, 4 piece 11-3 ¼ in plug body x ¼ in female NPT.