I have just fitted O-Rings to both filler caps. What a difference they made! No more pressure loss. I didn't realise that there was any pressure loss from the r/h tank until an O-Ring was put in the l/h filler cap. The l/h burner then so outperformed the r/h burner that I converted it to an O-ring too.
5/8" ID by 1/8" wall section is the size I chose. This size fits a variety of standard sized filler caps. I recommend 'em.
Dave.
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