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Give it purpose - fill it with water filters, air filters, refrigerator filters, and more.
The GeneralAire 12757 Pleat Spacer Replacement fits the following model of air cleaner:
This pleat spacer holds the pleated humidifier filter's pleats open and in place. The GeneralAire 12757 Pleat Spacer Replacement is also known as GeneraAire part no. 4003.