3M Xtract™ Low Profile Finishing Back up Pad, 20425, 152 mm x 17.5 mm x 7.93 mm, External 53 Holes, 10 ea Case Min Qty Order:10 The Exhalation Valve Filter is The Exhalation Valve Filter is designed to help filter the exhaled breath of the respirator wearer and provides source control when worn with the 3M 6000 Series Half Facepiece Reusable Respirator Performs well on difficult to adhere surfaces such as high surface energy substrates 3M™ Hookit™ attachment system provides easy disc changes and optimizes disc life 3M Xtract™ Hookit™ Low Profile Finishing Back up Pad is constructed of soft density foam with a 10 degree blunt tapered edge and is recommended for finishing applications on flat or contoured surfaces