National 5 Gallon Cap. Stainless Steel Vertical Tank Shell M. P- 300 PSI, Total Length: 27″, Dia: 9″. (3) 1/2 NPT Top Ports (1) 1/2 NPT Bottom Port, (1) 1/4 NPT Top Port. The item you receive may not be the exact one pictured when multiple items are listed. UPS 3 Day Select. UPS 2 Day Air. Your business is important to us.