Restrictors are designed to fit in a recess either in a Shower Head, Hand Shower or 1/2 inch BSP Male - Female Housing that fits on a shower arm or shower wall outlet.
Restrictors fit in a recess 14mm diameter and 2.5 mm deep.
Top (inlet) of Flow Restrictor/ Flow Limiter is 16.4mm in diameter.
Rubber washer should be positioned on top of Flow Restrictor/ Flow Limiter (as shown in picture above).
Flow Restrictor 5mm thick.
Rubber Washer supplied 19mm outside diameter, 12mm inside diameter, 3mm thick ( Special size for use with flow restrictors).
6 Litre colour code Green.
8 Litre colour code Blue.
4 Litre colour code Yellow.
Please note: Water saving flow restrictors or Water Saving Shower Heads are NOT suitable for use with Electric Showers* or Power Showers (Shower Pumps)**.
*Electric Showers restrict the water flow to heat water so they already are water efficient.
**Power Showers (Shower Pumps) require a certain flow of water to switch them on, check with the pump manufacturer for suitable ways to save water.