McAlpine MACVALVE-2 Self Closing Waste Valve - Loose Nut x Compression

The McAlpine Self-Closing Waste Valve 38mm delivers advanced membrane technology engineered to protect plumbing installations from foul odours and sewer gas ingress. The membrane opens automatically under water pressure to allow free discharge flow, then closes to form a positive seal. This valve operates without a traditional water seal, eliminating the risk of trap dry-out through evaporation or prolonged appliance inactivity. The design accommodates both horizontal and vertical installation positions for flexible deployment across diverse plumbing configurations. Featuring BSP female inlet connection and universal compression socket, the valve integrates seamlessly into existing systems. Suitable for applications where non-return functionality improves installation performance, though access for maintenance should be considered when specifying for shower tray installations. Features & Benefits: Self-closing membrane opens under water pressure then seals to prevent odour and sewer ga