RV Repair: propane lines, propane tank, pig tails

Question
I have a 1992 HI-LO camper. i have the original propane lines. on top of the vavle (i think thats what it is) there is a glass bulb that is broken off, exposing what looks like a rubber primer. with the glass broken-- it leaks the gas when the tanks are opened up. do i need to replace everything-- lines valves, etc or can i replace just the broken part?

Answer
KEN
YOUR REFERRING TO THE LP REGULATOR AUTOMATIC SWITCH-OVER SIGHT GLASS AND THE PROPANE TANK PIG-TAILS.
YOU SHOULD REPLACE ANY OF THAT THAT YOU SUSPECT AS QUESTIONABLE THE PARTS ARE THAT EXPENSIVE WHEN IT COMPARES TO SAFETY.
SAFETY FIRST.
YOU'LL BE NO GOOD TO YOURSELF IF YOU CATCH FIRE.

THOM