Warren Rupp Sandpiper Double Diaphragm Pump. Model: SB1 ½-A. S/N: 368785. Type: SGN-5-SS. The Sandpiper Heavy Duty Ball HDB (SB) Metallic Pumps are ideal for thin to viscous and small solids to laden fluids. The 1.5 size can do up to 90 GPM at low pressure, and up to 100 PSI with low flowrate. Sludge/Slurry applications are suitable if using the bottom discharge porting. See the chart below for more information on applications. Additional features: All Bolted, thick wall Construction. Durable Diaphragm Connecting Rod. Horizontal & Vertical Manifold Connections. Solids Range 0.25 (6mm) to 0.86 (22mm). Dry Primes up to 20 Feet of Water. Maximum recommended air pressure: 100 PSI. Inlet: (1) 2 in. S-line. (1) 2-1/2 in. S-line. Overall dimensions: 3 ft. 3 in. L x 1 ft. 7-3/8 in. W x 3 ft. 4-7/8 in. H.