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Biasi O-Ring Gasket 3.53mm x 18.64mm BI1621102

Biasi

Biasi O-Ring Gasket 3.53mm x 18.64mm BI1621102

Biasi BI1621102 O-ring gasket measuring 3.53 mm x 18.64 mm, suitable for Basica COND and Rinnova Adaptive boiler models.

At a glance

  • Also known as 1651784
Manufacturer part no.
BI1621102
Showing prices

£1.57

£1.31 ex. VAT · VAT at 20%

Available to order · 7 working days
Available to order · 7 working days
Not certain it's the right part? The technical team verifies fitment before dispatch — no charge, and it stops a second trip.Call the technical teamSend a technical question

Same-day dispatch

Ordered by 4pm Mon–Fri, 10:30am Sat.

30-day returns

Unused, in original packaging.

What it is

The Biasi BI1621102 is an O-ring gasket measuring 3.53 mm x 18.64 mm. It is used to seal a joint within the hydraulic circuit on Biasi Basica COND and Rinnova Adaptive boilers. The O-ring compresses between mating faces to prevent water weeping or air ingress at the connection.

Signs this part needs replacing

  • Water weeping or a visible drip at the joint the O-ring seals
  • The O-ring is flattened, cracked or perished when inspected
  • The rubber has hardened and no longer sits proud of its groove
  • Scale or corrosion debris trapped around the sealing face
  • A joint that continues to seep after the fitting has been re-tightened

Before you order

  • Confirm your boiler model against the fit list above
  • Check the existing O-ring dimensions match 3.53 mm x 18.64 mm
  • Inspect the mating faces for scoring or corrosion before refitting
  • Check how many O-rings the joint requires before ordering

Not sure which part?

Search by part number, product name or brand — our technical team confirms fitment before anything is dispatched.