hardened steel to resist breakage the blades 136 could be made of a softer metal to break off and not transfer energy to damage the pins a brass bushing could be placed around the pins to protect them from wear these bushings would be inserted around pins 134 fig1 shows one side of a single sided pump with housing 170 and outlet pipe flange 174 an impeller half 172 has an input shaft 173 bearing race 176 is part of housing 170 bearing 178 and sealing ring 180 seal input shaft 173 to the housing most designs utilize an electric motor to power the pump in this configuration the half of the impeller that is connected to the motor shaft is stationary all of the force generated between the two halves of the impellers push to the inlet side and seal between the high and low pressure sides the inlet or supply line bolts to the housing with the inlet tube of the impeller being inside of the supply line fig1 shows the other side of the single sided pump shown in fig1 there is impeller 182 sealing ring 186 housing 184 pipe flange 185 bearing 188 and sealing ring 190 which seal inlet tube 187 to housing 170 shown in fig1 fig1 shows housing 200 with multiple studs 202 for connection as best shown in fig1 as housing 16 there is a weep hole 204 in the intake side of housing 200 fig1 shows a cut through the intake side of housing 200 there is a shoulder 205 and the weep hole 204 in the intake side of housing 200 a canal 208 which starts at air gap 212 and ends at the weep hole outlet 210 if liquid passes through canal 208 it indicates.