SATA Jet Air Micrometer Seal (part #3970) For replacement of ALL GENERATIONS Full Size Jets & Sata 3ML gun lube. 1 each included in pricing with FREE shipping. We Have SOLD 100s of these seals, (this is a fresh list not reflecting that data) as they wear out and need proper lubrication which most people neglect. We have packaged the 3ml tube of SATA Gun lube to remedy that as well. Should be lubed upon installation.