It's not recommended to run very harsh chemicals like straight APC though this fitting. It can cause the aluminum to react to the chemical and possibly ruin the operation of the fittings along with the finish.
Ever since the quick disconnects for the PF22 came out, I've wanted to integrate a funnel to make filling the bottle with the quick disconnects better. My good friend Rusty reached out to me about creating some custom quick disconnects for the PF22 Foam Cannon and this is the end result. They're machined out of aluminum and then anodized in blue.
Let's get the price conversation out of the way, these aren't cheap and are made in small batches. However they're made here in the US and the quality is just amazing. You'll use it once and realize it's worth every penny.