Abstract: In a resilient chamber sampling apparatus incorporating a resilient body having a dished cavity area which is squeezed to pressure fluid trapped in the dished area, an improved form preferably incorporates an alternate anvil. It has a facing plate member at the end of the probe over a solid anvil. The cap or plate has a small hole in the center and telescopes with a small peripheral skirt aligning the cap with the resilient plug. On closure, high pressure is formed to force fluid from the cavity in the resilient body. When the probe is pulled away from the resilient body, the vacuum breaker slides in telescoping movement, and opens an external passage to fill the chamber where the fluid was pumped from, and the chamber is restored to its full size without pulling a vacuum, to avoid damage which might occur otherwise.