Vaillant filling loop leak

[Monty508]

Afternoon all,

My boiler pressure is slowly rising above green every other week and I've located the leak to be the check valves on both sides of the filling loop. Is there anyway I can cap one side off untill I can buy a new part? Furlough has made it hard financially atm. I've included a picture and one side of the filling loop is a small end compared to the other screw on end. Anyone know the measurements for a blank?

 

[Harvest Fields]

Have you tried taking the grey levers off (held in place by a screw) and tightened the valve underneath with an adjustable spanner?

 

[Monty508]

Have you tried taking the grey levers off (held in place by a screw) and tightened the valve underneath with an adjustable spanner?

I have yes, I had to remove the check valve and clean it all out as it was completely blocked up. I ran a cleaner round the system for a week, drained and then added inhibitor to the system but now I have this leak. One side of the filling loop is 1/4 inch? But the other is probably half the size

 

[Harvest Fields]

I think you need a new set of these mate