Isolating Valve 15mm 2 Pack (65251)

Hello ge0rgeme1kle, These are not the same as a ballofix as that is a registered trademark. You would need to speak to a local installer to see what would be required for your installation. Thank you for using Q&A

Hello Gollom, There is no fibre washer in the product. It has an o-ring as a gasket washer for this product, the material is EPDM and the size is 15 x 3.2mm. Thank you for using Q&A

Hello mickyives, Yes, these are bidirectional. Thank you for using Q&A

Hello, Do you mean used directly on the combi boiler set up (i.e the supply/feed pipes coming in/out of the boiler), or do you mean on a general plumbing system that is connected to a boiler? If you mean directly on the combi boiler set up then this is something that you need to check with a qualified installer and with the manufacturer of your boiler (they may require specific types of valves etc otherwise your warranty could be voided). If you meant can it be used on a general pipe system that is connected to a boiler, then yes this would likely be fine. They have a max pressure of 8.0bar, so check your water pressure first. We always recommend consulting with a tradesperson before purchasing or undertaking any installations/work. Thanks for using Q&A

Hello, No, these are 1/4 turn so 90 degrees clockwise closes and to open simply turn 90 degrees anti clockwise. If the slot of the screw is aligned with the pipe, then the valve is on and so water will be flowing through it. If the slot is running across the pipe then the valve is in the off position.