OPW 4 in. Tight-Fill Top-Seal Fill Cap
Tight-Fill Top-Seal Caps are used to cover top-seal adaptors when they’re not in service, helping prevent gasoline vapors from escaping while protecting the tank from rainwater, dust, and debris.
The OPW 634TT is built to fit 4″ OPW adaptors including the 633T, 633TE, 61SA, 633TC, and 633TCP. Its Duratuff® body resists corrosion and eliminates rust concerns, giving the cap a long, low-maintenance service life. The toggle lever applies even downward pressure across the Nitrile Rubber gasket to create a secure water/vapor-tight seal. For added security, the cap can be locked with a padlock or wire seal.
If you need to review 40 CFR compliance for your gasoline-dispensing facility, please refer to the appropriate regulatory guidance.
Is your gasoline-dispensing facility 40CFR compliant? Click HERE for more information.
