Wagner0414353 or 414353 or 2359314 Nozzle Gasket Seal

Where does this fit on the wagner control spray max?

Can anyone provide install instructions for this part? I am curious if it should be placed inside the nozzle or on the tip of the gun.

We are looking for part no.0417706 a nozzle seal. and part no. 2304 027 the diaphragm for the wagner 550 paint sprayer i wonder if you stock these .

does this fit wagner control spray