Get your John Guest 1/4" Faucet Connectors, we carry different sizing and connection types. The 1/4" Faucet Connector hooks directly to the faucet from your reverse osmosis line. As always, John Guest comes with quick connections that have push-fit technology. These connections make connecting and disconnecting quick, simple, and easy. The O-ring is food grade quality. These connections are for reverse osmosis water applications, not intended for compressed air or vacuum applications.