as a bucket or pan to be placed in the front of the unit to receive the draining boil out cleaning fluid this feature is advantageous because in many cases the pan 34 will contain the vat oil and it would be undesirable to have to pull the pan out in such instances referring now to fig6 7 another embodiment is shown in which boil out opening 300 b includes a flange 331 that is externally threaded in which case the cap member is internally threaded for attachment the boil out drain pipe 310 u2032 passes through opening 300 b without connection thereto the opening 320 is includes an internally located threaded coupling 332 for receiving the end 334 of the drain pipe 310 u2032 which is correspondingly threaded similar to fig5 the drain pipe 310 u2032 may extend out past the drawer when installed facilitating positioning of a boil out cleaning fluid receiving vessel thus for a typical boil out of a given vat oil is drained from the vat into the pan by opening the drain valve the drain valve is closed the vat is filled with the boil out cleaning fluid the heating system of the vat is operated for a cleaning time period the cap member associated with the boil out opening for the vat is removed.