Guardian 470-004R GS-Plus Eyewash Foam Filter, PK6

The Guardian 470-004R is the OEM replacement foam filter for the GS-Plus™ AP470-001 spray head used on Guardian Equipment eyewashes and eye/face washes. Sold in a pack of 6, the 470-004R is a standard replacement part that should be inspected and swapped out as part of routine eyewash maintenance to keep the spray heads delivering Guardian's tested soft, full water pattern.

Each filter is a 60 pore-per-inch (PPI) dense polyurethane foam disc, approximately 1-1/8" diameter, that sits inside the spray head body and helps screen sediment, scale, and particulates before water reaches the diffuser area.

What This Filter Fits

The 470-004R is the GS-Plus™ filter. Use it on any Guardian eyewash or eye/face wash equipped with the GS-Plus spray head — including:

• Guardian G1814 Wall-Mount Eyewash Station (stainless bowl)
• Guardian G1814P Wall-Mount Eyewash Station (plastic bowl)
• Guardian G1814-T Wall-Mount Eyewash Station (with trap)
• Guardian G1825 Pedestal-Mounted Eyewash Station
• Guardian G1909 Safety Shower / Eye-Face Wash Combo
• Guardian G5022 Deck-Mounted Eyewash / Drench Hose
• Guardian G5026 Wall-Mounted Dual-Head Eyewash / Drench Hose
• Plus other GS-Plus equipped Guardian models including G1805, G1806, G1849, G1891, G1902, G1991, G5046, GBF1724, GBF1909, and GBF1994

You can browse the full Guardian eyewash and shower line here if you're not sure which station you have.

Quick Check Before Ordering — GS-Plus or FS-Plus?

Pull a filter out of your existing spray head and measure the diameter:

• 1-1/8" diameter → you have a GS-Plus head. Order this part: 470-004R 
• 1-3/4" diameter → you have an FS-Plus head. Order 470-024R instead.

If you're not sure which spray head you have, compare your installed head to the AP470-001 GS-Plus spray head or call EyewashDirect before ordering.

Why A Clean Filter Matters

ANSI Z358.1 requires emergency eyewashes to deliver a controlled, low-velocity flow of flushing fluid for a full 15 minutes — and the standard requires weekly activation testing to verify operation and flush stagnant water from the supply line. Inspecting the spray heads during that weekly test is the standard time to catch debris, mineral buildup, and spray pattern issues.

The Guardian 470-004R filter helps screen sediment, scale, and particulates inside GS-Plus spray heads. A clogged or degraded filter can affect the spray pattern, reduce flow, and let particulates reach the diffusers — exactly when you can't afford it. Keeping replacement filters on hand is a low-cost way to keep stations operating to Guardian's tested performance.

How Many Do You Need?

Each pack contains 6 filters. Each GS-Plus spray head uses one filter, and most eyewash stations use two heads (one per eye), so a single pack covers three station rebuilds. For larger sites with multiple stations, order one pack per 3 stations and keep at least one pack in your maintenance closet as backup.

Rebuilding The Whole Spray Head?

The filter sits inside the GS-Plus spray head body, beneath the dust cover and above the flow control. Replacement is a hand-tool job — no plumbing required. If you're rebuilding the full spray head, also consider:

• AP470-002ORG-R — replacement dust cover and cap assembly (PK2)
• 470-005R — replacement 1.6 GPM flow control (PK6) — call EyewashDirect to order
• AP470-001 — complete replacement GS-Plus spray head assembly, if the body itself is damaged

Important: Guardian notes that when reinstalling the flow control, the concave end goes in first. The filter sits above it.

Why Guardian? Why EyewashDirect?

Guardian Equipment manufactures every part in their eyewash and emergency shower line in the USA, and the 470-004R is the OEM replacement filter listed for the GS-Plus spray head. Using the manufacturer's spec part keeps the spray head pattern within Guardian's tested performance range.

EyewashDirect carries the full Guardian repair parts catalog with same-business-day shipping on in-stock items, a Low Price Guarantee, and direct factory support if you're not sure which part you need.

Frequently Asked Questions

How often should I replace these filters?
Inspect the spray heads during weekly ANSI activation testing and replace the filters when they're clogged, missing, damaged, degraded, or affecting the spray pattern. Most facilities replace annually as a baseline; sites with hard water, high sediment, or older galvanized supply lines often replace more frequently.

How do I know if I need the 470-004R or the 470-024R?
Pull a filter from your existing spray head and measure the diameter. 1-1/8" = GS-Plus = order 470-004R (this product). 1-3/4" = FS-Plus = order 470-024R. The two filters are not interchangeable.

Will this fit older Guardian eyewashes from before 1997?
Guardian replaced the original GS spray head with the GS-Plus in January 1997, so units shipped after that date use the GS-Plus head and the 470-004R filter. For older legacy GS spray heads, confirm compatibility against your Guardian parts list or call EyewashDirect before ordering.

What's the filter actually made of?
60 pore-per-inch (PPI) dense polyurethane foam. The 60 PPI rating means 60 pores per linear inch of foam — fine enough to screen sediment and scale particles, open enough to maintain flow within the GS-Plus spray head's 30–100 PSI working range.

Is this an OEM Guardian part?
Yes. 470-004R is Guardian Equipment's listed replacement filter for the GS-Plus spray head, manufactured in the USA. Generic foam discs may not match the GS-Plus head's pore density or fit, which can affect the spray pattern.

What other parts wear out on a GS-Plus spray head?
The three serviceable parts inside the GS-Plus head are the foam filter (this product, 470-004R), the 1.6 GPM flow control (470-005R), and the dust cover/cap assembly (AP470-002ORG-R). If the head body itself is cracked or damaged, replace the complete assembly (AP470-001).