The 3M Full Facepiece Button 7989, Respiratory Protection Replacement Part is designed to attach 3M Head Strap Assembly 78093S (sold separately) to the 3M Full Facepiece 7800S Series (sold separately). Color indicates facepiece size; red=small, yellow=med

3M 26129, PPS Series 2.0 Adapter, Type S34, 3/8 Female, 18 Thread NPS, 7100135938
3M 54145, Full Facepiece Reusable Respirator 6700 Small, 7000002029, 4 EA/Case 
