ZLINE Recirculating Kit for Under Cabinet Range Hood (RK)(P) ZLINE Recirculating Kit for an Under Cabinet Range Hood. An efficient recirculating system that uses a charcoal filter to trap smoke, grease and odors at the source and recirculate air, no ducting required. ( P)(P) The compatible models are listed below: ( P)(UL)(LI) RK 30: Compatible with models 520 30, 523 30, 527 30, 619 30 and 623 30 ( LI)(LI) RK 36: Compatible with models 520 36, 523 36, 527 36, 619 36 and 623 36 ( LI)(LI) RK 42: Compatible