The KEW 127500037 Piston Seal Set is a critical, genuine replacement component designed for KEW and compatible Nilfisk-ALTO high-pressure washing equipment. This essential seal kit ensures a tight, leak-free seal around the piston, maintaining consistent pump pressure and preventing fluid bypass. Manufactured to OEM specifications with an outer diameter of 30 mm, an inner diameter of 20 mm, and a height of 5 mm, it guarantees reliable performance and extends the lifespan of your pressure washer pump. Ideal for maintenance and repair of compatible KEW 3000, 4000, 5000, and Nilfisk-ALTO C100, E130 models.