Sight glasses keep leaking

[cyclopath]

First try at diamonds, advice needed, please

right tool: DIN wrench. available at glacier tanks. https://www.glaciertanks.com/din-fittings-round-nuts.html maybe @precisionnick can share the tool they suggested for tightening DIN sightglasses back in 2015. I won’t. Picture below are the oil filter wrench I picked up at St Vinnies, and a decent approximation of a DIN spanner. I used the oil wrench to get the sight-glasses on that PX1 tightened down for my initial pressure test when the PX1 first arrived. I think it took me another wee…