Hydraulic Mechanical Seal Kit for Pioneer Pump models 108C24, 128S20, 128S22. Pioneer Pump part number PMP-372000122 – a direct-fit replacement supplied by VIP Hose and Seals. Ordering by part number or machine model ensures you receive the correct part for your unit. In stock and shipped the same business day on orders placed by 3:00 PM Eastern. Free ground shipping on U.S. orders over $100. Not sure this is the right part? Call (201) 458-4686 and our team will confirm fitment before you order.