These 231 models have a different air valve system, so they need a different rebuild kit than the other IR231 models.
2235-TK1 Ingersoll-Rand Tune Up Kit For IR Models 2235TiMAX & 2235QTiMAX
2135-TK2 Ingersoll-Rand Tune Up Kit For IR Models 2135TiMax, PTi, Ti & 2350XP
Ingersoll-Rand Tune Up Kit for IR Models 231, 231C And 231H, Part # 231-TK3
Custom I-R Air Inlet Kit (3 Parts) For IR Models 231G, 231H, 231HA & 231XP
Chicago Pneumatic Tune-Up Kit For CP Models CP7778 & CP7778-6, Part # 8940162816
Chicago Pneumatic Tune-Up Kit For CP Models CP734H, Part # CA147716
