Features 1.Plastic barb connector, made of high-quality PVED material 2.This check valve allow the liquid or air to motion in only one direction, thus stopping backward motion. 3.We provide with satisfactory service. If you have any questions about our products, you can send us an email and we will give you a satisfactory answer. Specifications: Quantity: 4 pack Material: made of high-quality PVED material Color: white Size:Overall Size: 2.1" x 0.58" / 5.3 x 1.5 cm (L*Max.D). Can fit 3/8" (10MM) hose ID Package includes: 4 x Check Valve NOTE Please Understand Due to manual measurement, it allows 1-2(mm) discrepancy. Please be reminded that due to lighting effects and monitor's brightness/contrast settings etc., the color tone of the website's photo and the actual item could be slightly different.