The Brita Purity C Filter Head enables a variable by-pass setting of 0 – 70 %.  The Brita Filter Head has 3/8″ bsp male inlet and outlets with a mounting bracket. The head also includes a flush and bleed valve. Suitable for all the Brita Purity C range of filters Quell ST, Finest, C1000 AC and Fresh, it is the perfect contingency for maintaining the condition of your purity filter.