• HepvO can be installed vertically or horizontally, or any angle in-between. When installing horizontally a minimum allowable slope of 1/8” (3.175mm) per foot (30.48cm) must be maintained to ensure good drainage. This can be achieved by using the HepvO Angled Adapter supplied in the HepvO kit.

  • When installed at any angle other than vertically, the HepvO must have ‘ribs down’ to ensure correct drainage.

  • HepvO valves must be installed in the correct direction of flow which is clearly marked on the body of the product.

  • HepvO must be installed either immediately at the exit of each fixture, or in-line up to a maximum distance of 6ft from the exit of the fixture. Note that when used to protect a single fixture HepvO must always be installed upstream of any tees or branch connections to other waste pipes.

  • HepvO must be installed in an accessible location.



No routine or seasonal maintenance is required for the HepvO sanitary waste valve, however, should you blow-out your drainage lines do not exceed 80-100 psi.

  • HepvO is resistant to standard caustic-based drain cleaners. It is also resistant to acid-based cleaners with concentrations up to 10%. When flushing with higher concentrations of acid based cleaner, the valve must be removed before the operation.
  • If mechanical drain cleaning devices are to be used it is necessary to first remove HepvO from the waste system. This provides a useful access point for servicing downstream pipework.
  • It is good practice to rinse the HepvO valve with clean water after any maintenance procedure.


If a pipe blockage occurs downstream of HepvO we recommend temporarily removing the HepvO valve before rodding the pipeline. If the HepvO is rodded there is the possibility that damage to the internal components will occur.