Feature:1. Thread dimensions for the small line or high side are M16 x 1.5m/4.9ft thread, M27 X 2m/6.6ft thread of the low side or larger line.2. This rear air A/C block closure kit is easy to install and takes about 10 minutes to complete. No need to make any modifications to the front air conditioning line. Simply disconnect the rear line under the hood and install the kit.3. This allows operation from the rear line or pre-evaporator air conditioning without loss of refrigerant.4. Repaire the leakage of the rear air conditioning system by eliminating the rear system and pre-reserving air conditioning, economic and convenient in use.5. Used to block off the rear A/C, which fits for Suburban 1996 1999.Specification:Item Type: Rear AC block off kit Condition: Brand newColor: As pictures shownThread size of small line or high side: M16 x 1.5m/4.9ftThread size of low side or larger line: M27 X 2m/6.6ftFitment: Fit for Suburban 1996 1999Fit for TahoeFit for YukonFit for GMC Denali Fit for Cadillac EscaladePackage List:1 x M16 Thread 1 x M27 Thread 2 x O-Ring