+3 WASHER MAST BASE H17/20 52411001 $10.99 In stock Quantity: 1 Add to Bag Product Details UPC: 792176620570 Brand: Hobie Part #: 52411001 Hobie 17/20 Mastbase Washer Hobie factory replacement mast base washer for the Hobie 17 or Hobie 20. Save this product for later Favorite