Delta 81TBP150 Delta 81TBP150 Commercial Exposed TECK Bedpan Washer Flush Valve. Delta Commercial Exposed TECK Bedpan Washer Flush Valve. Quiet action, Teck exposed diaphragm flush valve with renewable seat, and a Metal Non hold open handle for manual flushing. Bedpan Washer Diverter Assembly includes the following features: A solid brass spray arm, a diverter valve wall support, and an external water conserving flush adjustment: Field Adjustable from 4.8L to 25L (1.27 to 6.6 Gal.). Polished Chrome Finished.