Titan SC6 515 Spray Tip 661-515 or 661515 Titan SC6 515 Spray Tip 661-515 or 661515. The SC6 515 661-515 is equal in performance to the SC6 515 662-515. Solvent Proof Seal, Hand tight design. Highest quality tungsten carbide assures longest life and durability. Flow indicator, One seal for all coatings.