I found two stems in my junk drawer. They are about 4.5" long and resemble a Kirsten stem. They have a stopper or larger flange on the very end of the metal rod thing and they also have a plunger type effect. You can hold the mouthpiece and press down while holding an outer collar near where the metal starts and it moves up and down. I know you are going to say pics would help, but I thought I would toss this out in case anyone easily knew what the are for. I will post pics tomorrow if I haven't gotten to the bottom of these little buggers.