Siamp Optima 49 Dual Flush Outlet Valve


In Stock Ready For Delivery


Siamp Optima 49 Telescopic Dual Flush Valve is suited for plastic or ceramic cisterns. It works with a dual flush button and is WRAS and NF certified. The overflow can be cut in increments of 4mm while the small adjustable flush, is from 2l to 4.5l. It offers a High flush rate of 3.5l/s while a foam pan seal compensates for pan irregularity. The cistern lid can be fixed with a stirrup, and the flush valve comes with a ten-year guarantee from the manufacturer.


  • Can be installed into plastic or ceramic cisterns
  • Dual flush button
  • WRAS and NF certified
  • Actuation effort below 20 Newton
  • For lid holes ranging from 16 to 50mm, with or without collar depending on the diameter
  • Button off-center +/- 15mm
  • Stirrup: adjustable in increments of 12 mm
  • Overflow can be cut in increments of 4mm
  • Adjustable small flush, from 2l to 4.5l
  • Adjustable deadwater level
  • High flush rate of 3.5l/s
  • Foam pan seal supplied for compensating pan irregularity
  • The stirrup fixes the cistern lid, once the button is screwed down and enables a non-alignment position
  • Adjustable button and optional collar
  • Adjustable height from 282 and 430mm
  • lid hole from 16 to 50, discharge hole from 58 to 72mm
  • Adjustable: Small flush, overflow, dead water level
  • Adjustable overflow height: 155 to 245mm (C)
  • Adjustable height (B): With Collar: from 282mm min to 430mm max (Lid hole Ø ranging from 16 to 38mm and 43 to 50mm)
  • Adjustable height (B): Without: from 300 to 448mm (Lid hole ranging from Ø 39 to 42mm)
  • Compatible with:- Lid hole Ø (A) from 16 to 50mm
  • Drainage hole Ø (D) from 58 to 72mm
  • Installation instruction provide in technical tab
  • Refer technical diagram for more technical detail
  • 10 year guarantee from the manufacturer.







Weight1 kg


Estimated Delivery: 2-3 Working Days (Subject to your order being in stock)

FREE Delivery on Small Items. Minimum Spend £99

Standard Small Parcel Delivery: £3.50

Standard Parcel Delivery: £9.95

Standard Large Parcel Delivery: £19.95

Additional costs apply to deliveries to Scottish Highlands and some other postcodes.

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The delivery timescale of an order is dependent on the size of the largest item in the order, relating to the guide above.


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