Abstract: Coupler/diverter has housing with an aerator at the bottom and an inner barrel having rotary valving stem serving to distribute supply water, brine and overflow from RO filter. Depending on the setting, the stem permits flow through the housing to issue in the usual aerated stream. At this setting it also shuts off all other flow for decoupling. In diverting setting it sends supply to filter, shuttles return brine flush to the outside of the housing and lets reservoir overflow pass through the aerator. In a working setting the stem also can control volume of brine return to a varying degree to optimize the operation of the RO filter.

Abstract: A filter apparatus and distributor plate therefor of the quick-change type which are easily fabricated from plastic material by injection molding are disclosed. The distributor plates which are flangeless can accommodate one, two, three or more canisters. The canisters which are neckless have two prong-like arcuate member with flanges. The prong-like members extend through the distributor plate and the canisters are secured to the distributor plate by locking knobs which have mating flanges for engaging the flanges on the prong-like members. Opposing ports in the canisters and distributor plate are seal by O-rings which are housed on the flat top surface of the canisters. For filter apparatuses having more than one canister, the distributor is preferably made in two parts, namely a main body part and an insert part which are bonded into a single unitary part by sonic welding.