Piston Head/Air Tube Assembly for leather Seal version of the Model 25 1920-1958. These are reproductions. They need minor fitting. The air Tube length may have to be shortened. This is trial and error. It's different for each gun due to Spring compression and Seal thickness. Start small. The fitting is because the air Tube will most likely be too long. Order Leather Seals separately. The factory plunger heads shanks are tapered from .375 to .350 to make assembly during manufacturing fast and easy. The plunger head shanks we make are .360 +/_ .015 and will fit in all 3/8 plunger casings. Ours are not tapered, we make them straight and a little longer for better fit and to be longer lasting. The plunger casing takes a beating from the spring and can take on a bend, ending up slightly smaller in diameter. If the plunger head does not fit in your plunger casing, you might have to open up the split seam near the plunger head.
