Phoenix Pre‑Filter for Phoenix Guardian R Air Scrubber Duct Cleaning Adapts 2 inch vacuum hose

Adapts 2 inch vacuum hose to a 1

It also swings further across the pressure range than any other tip in the set

Suitable for Hydramaster CDS 4

A cap that doesn't seal properly can upset chemical draw and lets concentrate leak around in the van

The part that breaks first

Phoenix Pre‑Filter for Phoenix Guardian R Air Scrubber Duct Cleaning Adapts 2 inch vacuum hoseOverview First stage pleated pre filter, 1" 18" 18". Phoenix part number 4031877. It is the first filter the air meets in a Guardian R air scrubber, and its job is to protect the HEPA filter behind it. What it fits Phoenix Guardian R air scrubber named as item 1 in the Guardian R Pro 50 Hz service parts list, Air Filter, Pleated, 1" 18" 18" The filter stack, and why the order matters The Guardian R runs a staged filter arrangement: Stage 1 pre filter