unvented ticket

M

mah

hi just wandering, i need to change the pump valves for a bronze pump on the secondary return. and an aav primary flow to an unvented cylinder. would this need me to have an unvented ticket to carry out these jobs any help thanks.
 
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i thinkj oil is right its my understanding that you only need G3 for installation and repair of the unit not for anything outside
 

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