This is a high temp silicone o-ring that will fit a 1/4″ thread whether it’s standard or NPT (actual: 1/2″ ID x 5/8″ OD). It will also fit a 1/4″ NPS (straight thread) locknut.
- Fits 1/4″ threads (NPT or Straight; Male or Female)
- Great for use with a sight glass