Test Cap, For Use With Mfr. Model Number 38528, 38529, 38530, 38531, 38532, 38533, 38535, 38536, 38537, 38540, 38541, 38542, 38543, 38545, 38546, 38547, 38548, 38551, 38552, 38553, 38554, 38555, 38560, 38561, 38562, 38563, Fits Brand Oatey, For Use With Quadtro Washing Machine Outlet Boxes