Robinair's No. 40572 Caps for Robinair Quick Seal adapters feature a 1/4 inch female flare, machined brass construction, and internal gaskets that ensure a leak-proof seal. Knurling enables easy hand loosening and tightening. Pack of 6. Robinair, a Bosch Automotive Service Solutions brand, is a global leader in service tools and equipment based in Owatonna, Minnesota. Robinair is recognized throughout the world as the quality and performance leader in AC/R evacuation tools and this position has led to its success with the full range of products that serve the heating/ventilating/air conditioning/refrigeration (HVAC-R) and mobile markets.