Rinnai® Bypass Valve, Sensei Series, 6 in L x 4.1 in W x 3.3 in H, For Use With: CU160eN, CU160eP, CU160iN, CU160iP, CU199eN, CU199eP, CU199iN, CU199iP, RSC160eN, RSC160eP, RSC160iN, RSC160iP, RSC199eN, RSC199eP, RSC199iN, RSC199iP, RU130eN, RU130eP, RU130iN, RU130iP, RU160eN, RU160eP, RU160iN, RU160iP, RU180eN, RU180eP, RU180iN, RU180iP, RU199eN, RU199eP, RU199iN, RU199iP, RUR160eN, RUR160eP, RUR160iN, RUR160iP, RUR199eN, RUR199eP, RUR199iN and RUR199iP Tankless Water Heaters