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Stainless steel Y strainer with FNPT ends, compact angled body

Mueller Steam Specialty

Mueller Steam Specialty 581-SS 1/2" FNPT Y Strainer 304 SS 440 psi

SKU CH-WZ2R-WDAR1

A 1/2-inch FNPT Y-strainer with 304 stainless steel body and screen rated to 440 psi at 100°F

  • Protects steam and water lines with 440 psi pressure rating
  • 304 stainless steel housing resists corrosion in harsh environments
  • Fine 0.062 in perforated screen traps debris effectively
  • Class 600 construction ensures reliable high-pressure performance
  • Female NPT connections allow direct 1/2 in pipe installation

1/2" FNPT Y Strainer for Steam and Water

The Mueller Steam Specialty 581-SS is a 1/2 inch female NPT Y-type strainer built from 304 stainless steel. It is suited for steam and water lines where debris protection is required. The Class 600 rating supports a maximum pressure of 440 psi at 100 degrees Fahrenheit.

Pressure rating and blow-off convenience

The strainer handles 440 psi at 100 degrees Fahrenheit within its 3 inch length and 4 3/8 inch height. A 1/4 inch blow-off port allows screen cleaning without removing the body from the pipeline. The 304 stainless steel screen uses 0.062 inch perforations to trap particles while maintaining flow.

Stainless construction and female threaded ends

Both the housing and the screen are 304 stainless steel for corrosion resistance in steam and water service. The two 1/2 inch FNPT connections thread directly into standard pipe fittings. The included screen is removable through the blow-off port for routine maintenance.

Highlights

  • Protects steam and water lines with 440 psi pressure rating
  • 304 stainless steel housing resists corrosion in harsh environments
  • Fine 0.062 in perforated screen traps debris effectively
  • Class 600 construction ensures reliable high-pressure performance
  • Female NPT connections allow direct 1/2 in pipe installation

Specifications

BrandMUELLER STEAM SPECIALTY

Questions about this item

How is the 1/2" FNPT Y strainer installed and what step is often missed?

Thread the female NPT ends onto matching male pipe threads using suitable sealant; the step often missed is orienting the screen chamber downward so debris collects in the 1/4" blow-off port for easy flushing.

What maintenance will the 304 stainless screen with 0.062" perforations need later?

Periodically open the 1/4" blow-off valve or remove the screen to flush trapped particles; inspect the 304 stainless screen for distortion or corrosion and replace it if the 0.062" holes become enlarged or blocked.

What limit appears first during sustained steam service at the rated 440 psi?

The 100°F maximum temperature rating is reached well before the 440 psi pressure limit, so temperature governs continuous steam use for this Class 600 strainer.

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