Up for sale is one Parker Vacumatic Diaphragm for the Parker Majors, Jrs, 51s, Debutantes, Late 40's Duofold, Ingenue and other Speedline filler fountain pens - the diaphragm on the left in the picture - the smallest. The Parker given name for this item is a Diaphragm (often referred to as a Sac as it looks a lot like a conventional Sac), but it doesn't really hold any ink like a conventional ink sac. Instead, when the filling plunger is pressed, the diaphragm is extended inside the barrel forcing air out. When the plunger is released the diaphragm retracts pulling ink in through the feed. It takes about 8 - 10 plunges to fill a Vac to capacity - pause briefly between plunges to allow the ink to be fully pulled into the barrel.

This Diaphragm is brand new and recently molded and includes the retention pellet. I use them myself to repair Vacumatics and have never had a problem. Before installing, trim it to 1 1/16 inches long.

The following chart might be of use as a guide in selecting the right size diaphragm - all three are in separate listings.

Diaphragm Size & Model Used On:

• Oversize: Oversize Lockdown and Sr. Maxima Speedline

• Standard: Standard Lockdown, Maxima Speedline or Plastic Plunger

• Debutante: Major, Junior, Late Model 1940's Duofold, Ingenue, “51”s, Debutantes, other Speedline fillers

I ship same or next business day.