restrictor, a part for pool heater
outer diameter: 0.750 +/- 0.010 inch,
inner through hole diameter 0.421 +/- 0.010 inch,
length 0.700 +/- 0.010 inch,
outer diameter of knurl: 0.690 +/- 0.010 inch
mechanical
straight knurls, angle tooth 900, circular pitch 0.049, number of teeth: 44
material: naval brass C48500
manufactured by CNC lathe turning & milling
