PELCO® NW/KF to Quick Compression Couplings NW/KF Quick Compression Couplercap off NW/KF Quick Compression Coupler Componentsexpanded These NW / KF to Quick Compression Couplings allow the connection of standard tube or vacuum gauges to vacuum systems. Available for several standard tube sizes on NW16, NW25 and NW40. A convenient way to connect tubes without the need for welding. Ideal for temporary, test and research set-ups. Allows for adjustment and can be easily removed for a vacuum system. All stainless steel 304 construction with adapter, compression ring, cap and O-ring. Replacement Viton® O-Rings for Quick Compression Couplings Blank Plugs for Quick Compression Couplings