Vacuum Cap Assortment #4804 (Set of 20) - Edelbrock, LLC.
Buy SeaLife SportDiver Vacuum Check Port Cap (SL40014) - AF Marcotec
MERIGLARE 80 Pack Vacuum Cap Assortment Automotive Carb Line & Hose Caps Kit 5/32" to 3/8" Sizes Black Round Rubber Cap Assortment Set Cover Screw Thread Protectors for Carburetor Manifold : Amazon.co.uk: