W.W. Grainger, Chicago, IL, distributor of facilities maintenance supplies, has released its updated 2007 catalog with more than 138,000 MRO products, an increase of 23,000 over last year.   ; Last year, the distributor increased its catalog by 40%, adding 39,000 new products.   ; As planned, for 2007 Grainger has added more than 7,000 plumbing products, including high-grade pipes, valves and fittings; 4,000 material handling supplies such as conveyors, hoists and casters; 5,000 fasteners including nuts, bolts and screws; as well as 1,600 security products including locks and hinges.   ; The company expects incremental sales from its ongoing product expansion to account for 1 to 2 percentage points of its growth in 2007. The new catalog has more than 3,000 pages.   ; In addition, online Grainger has added new search and selection tools at grainger.com to help customers narrow their selection to the correct product based on factors related to the product or its application. Advanced cross-referencing tools, a new dedicated plumbing catalog and employee product training are also part of Grainger's strategy to improve customers' search.