Alley
Like the Dragons, good size & design. Where did you find? Any problems ,with a curved surface, applying?

My issue with the petcock was the height of the interior stem. Tech staff at Pingel advised with my 818a Paughco tank I need to reduce length of stem inside to allow 1/2 to 3/4 gallon reserve (instead of 2) and rest of the 3 gallons will flow well with Petcock 'on'.
Fears of clogging interior Petcock screen unfounded. Pipe cutter & heating the garage on a cold humid day (gas level condensates, showing fuel level) will allow measuring for new stem length & solve issue.