Product Review

Specification:
Material: plastic
Color: red, black
Air Hole Diameter: approx. 5mm/ 0.19"
Overall Size: 5 x 1.5cm/ 1.9" x 0.6"(L* D)
Quantity: 16 (each color 8pcs)
Weight: 0.07-0.14 ounce/2-4g

Warm tips:
Please check if install correctly.
One check valve is required for each outlet, and two for double-head pumps, and so on.
Please use a paperclip to poke it from Input side to Ouput side when the outlet inside gets stuck.

Package included:
8 x black check valve
8 x red check valve