price you are paying is 4 pieces(set of 2) for $26, you will received 4 pieces with one shipment! 3M Part #502 Respirator Adapter For Easi-Air 5000 6000 7000 Series. You can purchase individually or buy a box of 20 pieces or buy a case of 100(5 small boxes)------I am selling all brand new in manufacture package unless you buy less then 20. as you can see from the pictures, they all in boxes, never sealed with any bags! THEY ARE NOT FILTERS! If you are buying 100 pieces, I will post package of a box with 100 pieces(5 SMALL BOXES). If you are buying just one or 2 pieces, I will just pack the adapter shipped with USPS Priority Mail. AS you see from pictures I can't give all you an original packaging box unless you buy 20 pieces. Thank you for understanding ;o) Message me if you need to buy 20 piece or more.Thank you!