Vacuum Cap Assortment Performance Tool - W5214 - Grommet Assortment Nitrile Rubber Vacuum Caps Heat Resistant These vacuum caps are constructed from durable, heat-resistant Nitrile rubber Hardware Machinery Vacuum Cap Assortment 80 Piece Cap lines and hoses while testing emission control systems, diaphragm and much more. 80-piece nitrile butadiene rubber (NBR) assortment for use in most applications; Includes 20 each of 3/16, 5/32 and 7/32; 10 each of 1/4... This vacuum cap kit provides a quick and sure way to seal vacuum connections BUSY-CORNER 105 Pieces Vacuum Cap Assortment Kit, Dropper ID 3/8'' 5/16'' 1/4'' 7/32'' 5/32'' 3 These vacuum caps are constructed from durable, heat-resistant Nitrile rubber.