Mains Water Switchover Devices Mains Water Switchover Devices are used when you may run out of water in your rainwater tank and need to switch back to mains water. Several options are available. For more information, contact one of our friendly staff members. Print Friendly Page BR-MK6 Call for Price Compare BR-MK4E Call for Price Compare AS-3-4(3/4 Inch) Call for Price Compare AS-1(1 Inch) Call for Price Compare ARA-LTR20 Call for Price Compare DR-KRB1 Call for Price Compare DR-KRB2 Call for Price Compare DR-KRB3 Call for Price Compare DR-KRBS1 Call for Price Compare DR-KRBS2 Call for Price Compare