Genuine Wagner 0270201 Diaphragm Assembly Fits ALL Wagner Wave Series Diaphragm Pumps: 404+, 425, 505, 525, 650, 655, 831, 833, 834, 835, 836, 838, 1050, 1150. Wagner Pro Gold: 841, 844, 848, 850. Refer to your manual or website for part numbers and detailed information. This is an OEM part.