Carrier 16X25X5-1/4-M11 Filter 321702-401 What is the connection size

What is the connection size for this gauge

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Carrier 16X25X5-1/4-M11 Filter 321702-401 What is the connection sizeThe Carrier 16X25X5 1 4 M11 is a high capacity deep pleat air filter engineered for professional grade filtration in Carrier and Bryant media cabinets. With an actual size of 15. 375 x 25. 5 x 5. 25 inches, this MERV 11 filter provides a precise fit for 5 1 4 inch nominal housings, ensuring that air does not bypass the media. This ensures total protection for the evaporator coil and internal components of the furnace or air handler by capturing up to