Note: This does not fit the 10K 2009 and newer 10,000# general duty axles from Dexter #21-88. Replace Part Number: 21-36, 2136, K71-148-00, K7114800.High Hardness: 21-36 oil cap is made of high quality durable plastic, effectively resist breakage and explosions. 4" Oil Cap Kit - Fits Dexter® 9K, 10K, 12K, 15K - Caps, Plugs, O-Rings Included - SKU K71148 Trailer Dust Cap Hd Caps Vanshly, Oil Bath Dust Caps,for Dexter 9k-10K General Duty Axles Built After 1989, For Dexter 10K HD, 12K, 15K 4.0" Threads Trailer Axle Plastic Cover 21-36 Oil Caps 4PCS Kits 00 Caps Tavaski Oil Bath Dust Caps - K71-148-00 - Fits for Dexter 9k-10K... Specifications:10KHD to15K 4 OD Thread 12 Threads It features 4 OD thread with 12 threads per inch. These Oil Caps will replace your Dexter 21-36 Caps Oil bath dust caps For Dexter 9k-10K General Duty Axles Built After 1989 & Before July 2009, For Dexter 10K HD, 12K, & 15K Axles VEDURME 21-36 Oil Caps Bath Dust 2 PCS K71-148-00 Replacement for 9K-10K General...