Specification 4HV: Hand-switching Valve | series no. 2:2series 3:3series 4:4series | number of places 10:Two-position four-way 30: Three-position four-way | joint pipe code 06:PT1/8 08:PT1/4 10:PT3/8 15:PT1/2 20:PT3/4 | install type blank: body of vavle install S: panel install |