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Used to fasten greenhouse plastic, bird netting or shade cloth to PVC frames, especially where wind blows coverings off. They easily snap over PVC pipe.
Space clamps about 1 ft apart.
Use additional clamps in windier situations or use aluminum rowcover snap clamps to make the PVC snap clamps grip tighter.
Clamp size matches PVC pipe size (for example: 1" clamp fits 1" pipe).
Keep in mind the clamps are heat sensitive and may lose gripping strength if exposed to temperatures greater than 140°F or 60°C.