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Sirrus Assy SKBQ1503-973C Thermostat Element for Thermostatic Cartridge Assembly
Sirrus Assy SKBQ1503-973C Thermostat Element for Thermostatic Cartridge AssemblySKBQ1503-973C Thermostat ElementSirrus SKBQ1503-973C Thermostatic Cartridge Assembly (Includes Cartridge and Wax ElementSirrus SKBQ1503-973C Thermostatic Cartridge Assembly (Includes Cartridge and Wax ElementSirrus Element for Thermostatic Cartridge AssemblySirrus SKBQ1503-973C Thermostatic Cartridge AssembSirrus SKBQ1503-973C Thermostatic Cartridge Assembly (Includes Cartridge and Wax Element

Sirrus SKBQ1503-973C Thermostatic Cartridge Assembly (Includes Cartridge and Wax Element)

Part Number: SKBQ1503-973C

SALE: £127.03

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Product description


Sirrus SKBQ1503-973C Thermostatic Cartridge Assembly (Includes Cartridge and Wax Element) - Cartridge kit for BQTS1503ECP-1 and BQTS1503CCP-2.

Brand: Bristan Sirrus
Spare Part: Thermostatic Cartridge Assembly with Wax Element
Installation: Screw-In

This product is compatible with shower mixer valves:
- Bristan Prism Exposed Shower with Diverter
- ShowerForce / NewTeam 973-T and 974-T

The SKBQ1503-973C Thermostatic Cartridge Assembly can be dispatched on the same working day when ordered before 3:00 PM, Monday to Friday.

Technical Information: Bristan SKBQ1503-973C
Cartridge Measurements:
Total Length: 100mm
Diameter at Widest Point: 44.3mm

Shower Mixers and Thermostatic Cartridges
Thermostatic cartridges are fitted in a shower mixer valve. The cartridge regulates water temperature by mixing the incoming hot and cold water flow which is adjusted by a shower user through the valveā€™s control handle.

A wax element is the core of a thermostatic cartridge. It allows shower mixers to effectively temper how hot or cold shower water can be. This little capsule works by using thermal expansion to turn heat energy into mechanical energy. The application of such a principle came into the plumbing industry during the 1970s.

Bristan SKBQ1503-973C is a thermostatic cartridge assembly suitable with certain Bristan Prism and ShowerForce shower mixer. It comes with a cartridge, a wax element with spring, two o-rings, and a tube of silicone grease.

We have other in-stock Bristan Spare Parts.
- Please contact us if you need help finding the right cartridge for your shower.

How to Check if a Thermostatic Wax Element in the Bristan SKBQ1503-973C is Functioning Properly?
A thermostat element in good working condition should be able to modify water temperature without any difficulty. If you are having trouble adjusting the temperature or if it fluctuates when you are in the shower, the capsule could be the issue. Performing this simple test will tell if a thermostatic wax element is still functioning as intended.

1. Prepare two small cups of water: one hot and one cold.
2. Holding the capsule by its tip, lower it in cold water and take it out after a few seconds. With the drop in temperature, you should be able to gently push the pin down into the capsule. Mark the spot where the pin and the capsule meet.

3. Next, dunk it in hot water. As the temperature increases, the piston should rise by about three millimetres as the wax expands.
4. Remove it from the hot water and lower it back in the cold water. Remove after a few seconds. Gently push the pin back into the capsule. If it moves down, the thermostatic wax element is operating optimally.
shipping & Returns


  • Delivery of this item is priced as a 'small' packet. UK delivery costs £5.95.
  • For all in-stock spare parts the typical UK delivery timescale is 2-5 working days.
  • If you need a part urgently then we can provide a next-day (delivered Mon-Fri) UK delivery service for all in-stock small parcels ordered before 3.30pm, Monday - Friday.
  • Next day delivery is available to select at an additional charge during the checkout.
  • We delivery WORLDWIDE. For more information about international deliveries, read our delivery page.


  • If you need to return a part then please telephone Di Vapor on 0121 705 0866 with the reasons for the return within 14 days of receiving the goods.
  • For more information please see our terms and conditions.
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