Blue Lagoon O-ring NBR 56x3 - 3902041

Blue Lagoon O-ring NBR 56 × 3 mm – 3902041

Restore a watertight seal on your Blue Lagoon equipment with this original NBR O-ring (56 × 3 mm). It seals the housing-to-glass/quartz interface to prevent leaks and protect the UV-C or copper components. Available from PoolParthub.com.

Compatibility

Used in multiple Blue Lagoon systems that require a 56 × 3 mm seal, including:

• Blue Lagoon Copper Electrolyzer
• Blue Lagoon Tech Spa UV-C (housing/glass interface)

Also suitable wherever a 56 × 3 mm NBR O-ring is specified in Blue Lagoon housings.

What’s included

• 1 × O-ring NBR 56 × 3 mm (ref. 3902041)

Installation tips

• Clean grooves and glass/quartz surfaces before fitting; replace any damaged parts.
• Lightly lubricate with silicone grease (never petroleum-based) and avoid twisting the ring.
• Tighten evenly and leak-test after reassembly.

Specifications

• Reference: 3902041
• Material: NBR (nitrile rubber)
• Dimensions: 56 mm inner diameter × 3 mm cross-section
• Function: Housing-to-glass/quartz sealing ring

Good to know

For best results, renew O-rings whenever you replace the quartz sleeve or perform a full annual service. Keeping seals fresh maintains pressure integrity and UV performance.