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Siamp Optima 50 and 99B Standard Cistern Fittings Pack 37998007

100 % of 100
Item Code: SP026426
Supplied with Siamp Optima 50 dual flush outlet valve and Siamp inlet valve 99B. Sold in many Twyfords, Vitra, Lecico sanitaryware and B&Q bathroom packs.

Availability: In stock


Siamp Optima 50 and 99B Standard Cistern Fittings Pack 37998007

Why buy?

  • Pack includes ‘Optima’ 50 Outlet Valve and 99B Bottom Inlet Valve
  • Cable operated outlet valve
  • Dual flush
  • 470mm cable
  • 1.1/2” and 2” bayonet outlet
  • Chrome push button
  • Compact float valve
  • Anti-backflow function
  • WRAS approved
  • Easy to install
  • Manufactured in Monaco
  • 10 Year Guarantee


The Siamp Optima 50 fittings pack 37998007 is the only complete replacement suitable for use with most modern toilet cisterns. Supplied complete the Siamp Optima 50 outlet valve, Siamp 99B bottom inlet valve, cistern to pan kit, 470mm cable, 1.1/2” and 2” foam outlet washers, plastic jamb nut, chrome plated push button and collar. A sleek contemporary design and high-quality manufacturing delivers an excellent flush each time

Cable Operated
Cable operated outlet valve allows you to install the push button on the front, top or side of the toilet cistern

Dual flush

Delivers a water saving 3L flush when small button is pressed or a full 6L flush when large button is pressed

470mm cable

Supplied with a 470mm cable that is suitable for both standard and concealed toilet cistern applications

1.1/2" and 2" Bayonet Outlets

Comes fitted with 2" bayonet and additional 1.1/2" bayonet supplied in box. Bayonet fitting enables you to twist and pull the valve out without taking the cistern off the wc pan

Chrome push button

Smooth chrome plated push button is supplied with optional collar and is suitable for lid holes between 16mm and 50mm


Designed with an unobtrusive float mechanism, this inlet valve can be fitted inside even the smallest of toilet cisterns, perfect for any en-suite or WC

Anti-Backflow Function

Supplied with a built-in backflow prevention device to prevent contamination of the fresh water supply

WRAS Approved

WRAS stands for Water Regulations Advisory Scheme, a certification mark that demonstrates that an item complies with the high standards set out by water regulations

Easy to install

Supplied with comprehensive fitting instructions, this product could not be easier to install. With an easy to use click-lock fitting, this button can be fitted quickly and securely. This button is also supplied with a collar/shroud, this enables the button to fit a range of lid holes (from 16mm to 50mm) or so it can sit above the surface of the cistern lid

Manufactured in Monaco

The Siamp Optima 50 fittings pack 37998007 is manufactured in Monaco by Siamp who deliver a comprehensive line of innovative toilet repair products. Their products are based on quality, reliability and durability

10 Year Guarantee

Giving you that extra peace of mind, if the product breaks or doesn’t work then please let us know and we will be happy to refund or replace the item within 10 years of purchase


More Information
SKU SP026426
Manufacturer Siamp
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