Maxitrol 10"-22" Red Spring RED R13110, For RV131 / 210J Regulators10"-22" Red Spring For Maxitrol RV131 / 210J Regulators. Made in the USA. Product Specifications BRANDMaxitrol COLORRed REGULATOR COMPATABILITYRV131 / 210J SPRING RANGE INCHES10 - 22 LIMITED WARRANTY YEARS1 MANUFACTURER'S PART NUMBERRED R13110