Model:GRS-M001 Equal elbow Size: 8mm,10mm,12mm,15mm,22mm,28mm Model :GRS-M002 Equal male adaptor Size: 8mmx1/4",10mmx3/8",12mmx3/8",15mmx1/2", 15mmx3/4",22mmx1/2",22mmx3/4", 22mmx1",28mmx1" Model :GRS-M003 Equal female adaptor Size: 8mmx1/4",10mmx3/8",12mmx3/8",15mmx1/2", 15mmx3/4",22mmx1/2",22mmx3/4", 22mmx1",28mmx1" Model :GRS-M004 Reducing elbow Size: 10mmx8mm,12mmx10mm,15mmx12mm, 22mmx15mm,28mmx15mm,28mmx22mm, 35mmx28mm,35mmx22mm