A rotatable valve assembly for a faucet having an interchangable stainless steel plate which forms the interior flow passage of the valving member. The plate is secured to the valving member by depending tabs which engage reinforcement ribs formed in the valving member. The flow plate is of a one-piece...http://www.google.com/patents/US4700928?utm_source=gb-gplus-sharePatent US4700928 - Valve assembly
