Flat bottom flasks are suitable for pressureless work. Due to the standard ground joint, plungers can be connected to other ground joint components or closed with ground joint plugs.– Complies with DIN ISO 4797 – Tight closure due to standard ground joint – Fired-on, highly durable white print – Flat base means flasks can be set down without a supporting ring – Flat bottom flasks are suitable for pressureless work. Due to the standard ground joint, plungers can be connected to other ground joint components or closed with ground joint plugs.– Complies with DIN ISO 4797 – Tight closure due to standard ground joint – Fired-on, highly durable white print – Flat base means flasks can be set down without a supporting ring –