They require three holes for the faucet unit

Left Hand Mounting

makes finding the SE-220 easy in an emergency

4 inches or 5 inches

Dual-lever-handle two-hole centerset deck-mount kitchen sink faucets have two L-shaped handles that users pull toward or push away from themselves to start and stop the flow of water

Naugatuck Oblong Float Ball, 35.5 oz, 6 in dia., Stainless Steel - GR6X1019304SS Mounting-Recessed Mount They require three holes forThis float ball features stainless steel construction and is designed for use in open and closed tanks, high pressure and high temperature applications. Operating temp.: 30 to 225F.