The VH38 Head Q5486 connects to the Cartridge by the common screw method. Use the Omnipure 1/4 Inch Female Pipe Thread Valved Head with any of the Omnipure Q-Series Water Filters. The valved head allows you to automatically turn off the water supply by twisting off the Omnipure Q-Series water filters. This makes changing the water filters quick and easy. Mount the Q-Series 1/4-Inch FPT Valved Head with the Omnipure Q-Bracket.