Febco Cross Ref. #: 905-211 Febco 765 3/4" Bonnet & Poppet Assembly Backflow Preventer Repair Kit by Blue Heron. The Blue Heron backflow preventer for Febco 765 replaces OEM model 905-211. It is a heavy duty and lead free replacement part for Febco #765 pressure vacuum breakers, and is made 10in the USA. The Blue Heron backflow device has passed ASSE 1020 20testing standards as certified by IAPMO. An ideal replacement for leaking or freeze damaged Febco backflow preventers in your lawn, sprinkler, or irrigation device, Blue Heron backflow preventers keep water in your sprinkler system from siphoning back into your drinking water, and carry a three year manufacturers warranty. Febco is a registered trademark owned by Watts Water Technologies, Inc.