Cement Dump Bailer : A cylindrical container with a valve that is used to release small batches of cement downhole in a remedial cementing operating or for other special purposes. (WLOP)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}