Why not use a basketball.  Put the pump needle in and hook up the hose.
Seems that it would be easier to control the pressure.  Just a thought.

Bill
----- Original Message -----
From: "BRENT CHRISTENSEN" <bchristensen@INFOGENESIS.COM>
There is not that much pressure - keep in mind the air is coming from a tire
(usually).  There is a special cap that fits to the M/C.  A tube leads from
this cap to a canister that you fill with clean brake fluid.  There is a
tube from this canister than in turn leads to your pressure source.  It is a
really easy way to flush your system in about 15 minutes - literally.  I am
sure that the M/C can handle the 35-50 psi that are in the tire (or bottle
of anhydrous nitrogen...)

Brent Christensen
'89 GL Syncro Westy
Santa Barbara, CA