Assemble two (Item 21) balls, two new (Item 35) o-rings from the repair kit, (Items 32 and 39) seats (chamfered side into lower body first, if orifice is on seat 39, install with orifice toward the center of the pump) and two new (Item 20) flat seals from the repair kit into (Item 18) lower body.

NOTE: For models manufactured after 3-2-99, (Item 39) seats will not have orifice. Reference Service Bulletin #4-99.