O-Ring Seal for AstralPool / Hurlcon Viron QL420, QL540 & UF40 Filters — Main Body to Lid Seal (#22)

Replacement main body/lid O-ring for AstralPool / Hurlcon Viron QL420 and QL540 cartridge filters. Also suits the UF Ultra Fine UF40 filter housing. Restores an airtight, watertight seal to prevent leaks, air ingress, and pressure loss.

• Exact fit: Viron QL420, QL540 & UF40 lid-to-body seal (diagram reference #22).
• Durable elastomer: resists pool chemicals, UV, and weathering.
• Improves efficiency: maintains system pressure and filtration performance.
• DIY-friendly: quick install with basic tools and silicone lube.

Compatibility

• AstralPool / Hurlcon Viron QL420 Cartridge Filter
• AstralPool / Hurlcon Viron QL540 Cartridge Filter
• AstralPool UF Ultra Fine UF40 Filter

Also known as: lid O-ring, tank O-ring, body seal ring.

When to Replace

• Water weeping or drips around the lid clamp
• Excess bubbles in pump basket or pool returns (air leaks)
• Pressure drop or priming issues after cartridge cleaning
• O-ring is flattened, cracked, swollen, or sticky

What’s Included

1 × Main body/lid O-ring seal for the models listed above.

Installation (Quick Guide)

1. Turn off power and release pressure via the filter air bleed.
2. Remove the clamp/band and lift the lid straight up.
3. Clean the O-ring groove and seating surfaces (remove grit/old grease).
4. Lightly coat the new O-ring with 100% silicone-based lubricant (avoid petroleum jelly).
5. Seat O-ring evenly, refit lid, reinstall clamp per manufacturer specs.
6. Re-pressurise and check for leaks.

Maintenance tip: re-lubricate the O-ring at each cartridge clean.

Recommended Add-Ons

• Silicone O-Ring Lubricant
• Replacement Clamp/Band
• Filter Cartridge Cleaner

Keywords: AstralPool Viron QL420 O-ring, QL540 lid seal, UF40 O-ring replacement, Astral/Hurlcon cartridge filter body seal, pool filter spare parts Australia.