B&G SP-159 Soft Seat Gasket 22046300 for B&G Sprayer. When this part wears out you B&G Sprayer WILL leak. We reccommend you keep an extra one in your truck for emergencies. Be sure when installing it to put the rubber end facing the sprayer. Remind your technicians when they are repairing their B&G sprayer, DO NOT LOSE this part. We sell a lot of these because techs lose them.