Thermo pot hole size

[mrbees]

Hi,
My thermo pot already has a pre drilled hole in it.The hole in the inner skin is a lot smaller than the outer.What size fittings do i need to connect to a filter.

[lord groan]

You attach to the inner hole, the larger one is just to give better access for tightening the nut on the fitting. Without knowing what size thehole is its impossible to say exactly what you need. I used a tank connector on my hlt (its not a thermopot its a burco), same thing on my tun, I fitted a filter by pushing a bit of 15mm pipe into the inside of the tank connector and attaching the filter to the pipe.
Search 'tank connector' on the toolstation website for an idea

[angelHomeBrew]

Did you get the tea urn type tap that comes with the pre-drilled thermos pot sizes

You can separate the spacer fitting that comes with this and still use the spacer fitting writhe the pre- drilled holes

This spacer fitting has a 1/2" BSP female thread on outside and 3/8" BSP male thread on inside which goes through the smaller hole on inner skin

Screw a 1/2" BSP parallel nipple into the female thread on outside of the pot and you can fit it with a ball valve

You can then use a 1/2" to 3/8" reducing bush to tighten it up on inside leaving you with a 1/2" BSP male thread inside the pot to attach any fittings or filters. Use a 1/2"-3/8" reducing socket if you wanted a 1/2" BSP female thread inside the pot

I have some pictures somewhere if interested and still need any more help