51138-08743 3M Exhalation Valve,7283 Please log in to see price or purchase this item Quantity discounts available QuantityPrice SKU: MMM5113808743 Qty On Cart Features 3M Exhalation Valve 7283 50/Case. Replacement part for 3M Full Facepieces 7800S. Features Back Features3M Exhalation Valve 7283 50/Case. Replacement part for 3M Full Facepieces 7800S.