Comparison : Item # 21DBBNV4M, 4.882 Inch (in) Stem in Closed Position (A) Double Block and Bleed Needle Valve
Item # 21DBBNV4M4P, 4.882 Inch (in) Stem in Closed Position (A) Double Block and Bleed Needle Valve
Item # 21DBBNV6M, 4.776 Inch (in) Stem in Closed Position (A) Double Block and Bleed Needle Valve
Item # 21DBBNV6M6P, 4.776 Inch (in) Stem in Closed Position (A) Double Block and Bleed Needle Valve
Item # 21DBBNV9M, 5.646 Inch (in) Stem in Closed Position (A) Double Block and Bleed Needle Valve