Check the listing for details. AKM 32 Pcs JIS Cap & Plug Assortment Hydraulic Adapter Fitting Kit Set, Galva.... Condition: New. Listed at 79.42 USD. Manufacturer ‏ : ‎ AKM. #712 in Hydraulic Fittings. Fastener Type: Socket Head Cap. Most Commonly Ssed Size:4 6 8 12 16 20. Most Commonly Used Size:4 6 8 12 16 20. Color: Silver.