One-way valve quarter inch

Size 1/4 inch General note: 1- You can save and benefit from the shipping cost by purchasing other needs with this order for the same shipping value... but in one order 2- The buyer has the right to return the purchased item within 3 days from the date of receipt, and bears the full return costs 3- When receiving the returned item in good condition as sent, only the value of the item will be refunded, excluding shipping costs