Dispensing pressure vessels hold liquid for filtration through Millipore pressure-operated filter holders when connected to an external pressure source. Vessels meet ASME-UM Code requirements. Closures are secured by cam-lock handle. Vessels are fully autoclavable for sterile filtering applications when vented. Accessory code-complying relief valve, pressure gauge and hose connectors are available. An accessory closure allows vessels to be converted for vacuum use.