Masons Penetration Seals

Product Description


  • Compatible with all vertical underlays
  • Trim to size – always a secure fit
  • Two sizes cover penetrations from 1mm to 170mm (1mm-75mm. 80mm-170mm)
  • May be used with all flexible or rigid air barriers or synthetic flexible wall underlays 
  • Meets the requirements of the NZBC E2/AS1. To view the appraisal, go to 
  • May be exposed for up to 90 days
  • Easy installation
  • Affordable – great value for money
  • Sold individually, but also available in a bag of 10


Our Penetration Seals are a New Zealand Registered Design No. 427674