A modular center set faucet or bar spout in which the faucet trim or bar spout trim may be removed from or reinstalled from above the sink deck without affecting the waterway connections beneath the sink deck. Each faucet or bar spout assembly includes a valve body with a trim set. The valve body includes a pair of elongated tubular conduits spaced from each other to extend through the passages in the sink deck. A cartridge chamber is formed in each of the elongated tubular conduit with a cross conduit connecting the tubular conduits. A water outlet nipple leads from the cross conduit. The water outlet nipple has a slide-on fitting located above the sink deck when the pair of elongated tubular conduits are positioned to extend through the passages. The trim set may include a waterway and an escutcheon with the waterway positioned in the escutcheon. The waterway has a water inlet with a slide-on fitting extending outwardly of the escutcheon to connect with the slide-on fitting of the cross conduit when the trim set is installed on the valve body. The bar spout trim set includes an escutcheon, an adapter and a spout. The escutcheon has an open bottom and a spout connecting passage formed in its top surface. The spout adapter is positioned in the escutcheon and has a slide-on inlet connection to receive and connect to the water outlet nipple of the valve body. The spout assembly includes a spout having an inlet end and an outlet end. The inlet end is formed to be received in a spout adapter outlet with a hub positioned over the inlet end and threadedly connected to the adapter outlet to fasten the spout assembly to the spout adapter.