Blue Lagoon Nut 70 mm x 33.5 mm for end cap ABS Blue - B290010

B290010 – End-cap nut 70 × 33.5 mm (ABS, blue) for Blue Lagoon UV-C

Replace a worn or cracked end-cap nut with this genuine Blue Lagoon part in blue ABS. The B290010 nut secures the closing lid at the lamp/quartz end of the reactor body, restoring a clean, pressure-safe seal. Available from PoolParthub.com.

Compatibility

Fits Blue Lagoon UV-C housings that use the blue end-cap assembly, including:

• Timer UV-C 40 / 75 / 130 W
• Signal UV-C 40 / 75 / 130 W
• Xpert Duplex UV-C 80 / 140 W
• Xpose UV-C 42 W

Note: Not for Saltwater series (these typically use the black nut ref. 3901045).

What’s included

• 1 × End-cap nut 70 × 33.5 mm, ABS blue (ref. B290010)

Recommended accompanying parts

• Closing lid, black: F990196BU
• Quartz Glass Stabilizer kit: SP0095 / SP0073 (model-dependent)
• O-ring set for quartz glass: E800912 (3 pcs)

Installation & tips

• Disconnect power and depressurise. Inspect and clean sealing faces before fitting.
• Lightly grease O-rings with silicone grease; tighten the nut evenly by hand.
• Leak-test on restart; recheck after the first heating cycle.

Specifications

• Reference: B290010
• Function: End-cap retaining nut
• Dimensions: 70 mm × 33.5 mm
• Material: ABS, colour blue
• Series: Timer, Signal, Xpert Duplex, Xpose UV-C

Good to know

If the nut has been overtightened or UV-aged, also check the closing lid and O-rings. Replacing these together ensures long-term watertightness and easier seasonal servicing.