High Pressure Inline Sight Glass Select Size:1/2" FNPT The desiccant is known to

The desiccant is known to act as a molecular sieve with the bonus ability to tell visually when the molecular sieve achieves saturation

The inside diameter is 0

Here's a Bonus

it has an IP66 rating making it waterproof

High Pressure Inline Sight Glass Select Size:1/2" FNPT The desiccant is known toThese Stainless Steel inline sight glasses are designed for high pressure applications and come in 1 4", 3 8", or 1 2" FNPT OR Female Compression Connection. BVV PTFE High Pressure Inline Sight Glass Data Sheet *Data sheet shows specs for PTFE option only Specifications Female NPT Female Compression Connection Materials: Stainless Steel Borosilicate PTFE Seal or Viton Sizes Available: 1 4", 3 8", 1 2" Dimensions: LxWxH 1 4" 1. 75" x 1. 75" x 4" 1. 75"