Sparkler Plate Filter. Model 18D12. S/N 19489. Inside dimensions 20 in. L x 19 in. W x 23-1/2 in. H. Tank Mat'l 316. Jacket Material MS, Tank TH'K .141. Jacket thickness .104. Inlets/outlets (5) 4 in., (1) 1-1/2 in. (1) 3/8 in. Tank Working Press 60 PSIG at 350 °F. Tank Test Press 100 PSIG, Jacket work press 50 psig at 350 °F. Jacket Test Press 75 psig. (10) 17-1/2 in. Plates inside. The overall dimensions are 39 in. L x 35 in. W x 54 in. H.