Actually they are round, slotted washer-like plastic inserts that, when pushed into the Quick Disconnect, disengage the prongs over the flange that hold the connection together.
Someone said they're about 9 bucks for a set of 6 or 7 different sizes at Sears. You'll only need one size.
Someone said they're about 9 bucks for a set of 6 or 7 different sizes at Sears. You'll only need one size.