The equivalent RegO model would be LV404B34 1/4" fnpt inlet 1/2" fnpt outlet 450,000 btu capacity.
10 year warranty made in the USA.
Contact your local LP gas dealer, they may have it or can get it
Looking at the picture i found on line the 605h is not an auto change over. Its what is called an Integral two stage.
RegO's automatic would be 7525B34
Jim & Debbie England
Do you have Gas? 2015 F350 6.2L CCLB DRW 4.30 axle.
2020 Keystone Cougar 364BHL ,Gone 2012 Yellowstone Ridgeline 34RLT Fifth Wheel