... is produced by using gas-liquid filter screen which includes SP, HP, DP, HR patterns. 3) Metal thread diameter range: 0 ... .3 round wire or 0.1*.4, 0.1 *0.3, 0.2*0.4 flat wire. SP DP HR\HP Standard thread ... specification: 0.1+0.03*0.4 Standard thread specification: 0 ... mesh, screen, mesh and so on. Common gas-liquid filter 4