PC-NLF64D | Installation Kit WhisperLine 4/6 Inch 4 Inch Double Inlet Grille 2 4 Inch Backdraft Damper 12 Clamp 6x4x4 Inch Y Adapter Poly Pro/Steel for Ventilation Systems | Panasonic Contents_4 Bolt M4 STANDARD + is a

M4 STANDARD + is a premium-quality ball plunger designed to provide reliable and precise positioning in industrial applications

non-marring surface for precise gripping

- Precisely calibrated to release pressure at a predetermined level

4 CV 3/4 Inch NPT

here is a product description for the Jergens - 46921

PC-NLF64D | Installation Kit WhisperLine 4/6 Inch 4 Inch Double Inlet Grille 2 4 Inch Backdraft Damper 12 Clamp 6x4x4 Inch Y Adapter Poly Pro/Steel for Ventilation Systems | Panasonic Contents_4 Bolt M4 STANDARD + is aPanasonic Installation Kit WhisperLine for Ventilation Systems (PC NLF64D) The Panasonic Installation Kit WhisperLine (PC NLF64D) is a comprehensive solution for efficient ventilation in residential and commercial spaces. This kit includes a 4 inch double inlet grille, two 4 inch backdraft dampers, a 12 clamp, and a 6x4x4 inch Y adapter. Engineered from durable poly pro and steel, this kit provides a robust and long lasting solution for ventilation