Blue Lagoon O-ring 3-way connection NBR 53x4,5 - E801509

E801509 – O-ring for 3-way connection NBR 53 × 4.5 mm (set of 2)

Restore a leak-tight seal on Blue Lagoon 3-way unions with this genuine NBR O-ring set. Sized 53 × 4.5 mm, these rings fit the union seats on Spa UV-C and Copper Electrolyzer housings for clean, pressure-safe installs.

• Exact OEM size for Blue Lagoon 3-way unions
• Durable NBR rubber for chlorine/saltwater pools
• Supplied as a matched pair for inlet and outlet

Compatibility

Fits Blue Lagoon 3-way connection sets and housings, including:

• B212014 (50 mm) and B212015 (48 mm) 3-way connections
• B212013 Spa UV-C / Copper Electrolyzer housing
• Spa UV-C PL-S 12/15 W and Spa T5 21 W (U20/Z20)
• Blue Lagoon Copper Electrolyzer assemblies

What’s included

• 2 × O-rings NBR 53 × 4.5 mm (ref. E801509)

Installation tips

• Clean the grooves and mating faces; replace worn nuts and unions if needed.
• Lightly lubricate with silicone grease (do not use petroleum products).
• Tighten union nuts evenly and leak-test after pressurising.

Specifications

• Reference: E801509
• Size: 53 mm ID × 4.5 mm cross-section
• Material: NBR (nitrile rubber)
• Application: Seals for Blue Lagoon 3-way union connections

Good to know

Renewing O-rings whenever you service the quartz sleeve or unions prevents weeping and keeps your UV-C or copper system performing at its best. Matching nuts: 3901045.