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Comparison : Item # 502 2521, Fits Up to 1/4 Inch (in) Tubing Outer Diameter (OD) Plastic Pinch Clamp
Item # 502 2556, Fits Up to 1/2 Inch (in) Tubing Outer Diameter (OD) Plastic Pinch Clamp
Item # 502 2591, Fits Up to 3/4 Inch (in) Tubing Outer Diameter (OD) Plastic Pinch Clamp