Air Gap InternationalWater Filter/Softener With 3/4-inch Female Threaded Inlet for Use With 1-1/2-inch or 2 inches (with coupler) Standpipe (ET115-002, G-175, DLA-G15)

Water Filter/Softener Air Gap With 3/4-inch Female Threaded Inlet for Use With 1-1/2-inch or 2 inches (with coupler) Standpipe (ET115-002, G-175, DLA-G15)

Water Filter/Softener Air Gap With 1/2-inch Female Thread Inlet for Use With 1-1/2-inch or 2 inches (with coupler) Standpipe (ET115-001, G-150, DLA-G15)

Dual Air Gap for Water Softener and Reverse Osmosis with 5/8 or 1/2-inch and 3/8 or 1/4-inch inlets, 1-1/2 or 2-inch Standpipe (8500, GAP-CAP, AG130-001)