| 摘要 |
<p>An apparatus (10) for applying a pressure in a fluid in a selected one of two systems. A button member (12) moves axially inside a chamber (14) which causes fluid to be expelled from chambers (18) or (26) dependent upon which aperture (46) or (48) is closed off by the operating digit. If the digit is placed over aperture (46) and the button then pushed the fluid in chamber (26) shall be displaced from spigot (40). If the digit is placed over aperture (48) the other chamber (18) shall be displaced.</p> |
