Mueller Steam Specialty 581 CS Y Strainer 1 in FNPT accessory
Carbon steel Y-strainer with 304 stainless screen rated for 480 psi at 100 °F and 15 gpm flow
- Handles 480 psi at 100 °F for reliable steam service
- Class 600 carbon steel body resists high-pressure wear
- 304 stainless 0.062 in perforated screen traps debris
- 15 gpm Cv factor keeps flow efficient
- 1 in FNPT connections fit standard piping
1-inch FNPT Y strainer for steam and water systems
The Mueller Steam Specialty 581 CS Y strainer installs in a 1-inch female NPT line to trap debris before it reaches valves or pumps. Carbon steel housing rated Class 600 handles 480 psi at 100 degrees F and 1015 psi maximum pressure. A 304 stainless steel perforated screen with 0.062-inch holes ships installed. The 3/8-inch blow-off port allows cleaning without removing the body from the pipeline.
Inline protection that frees downstream components
The strainer body measures 4 5/8 inches long and 5 3/8 inches high, fitting between standard 1-inch FNPT fittings in steam or water service. Its 15 gpm Cv flow factor keeps pressure drop low while the screen catches scale and sediment. The blow-off connection lets operators flush captured material without breaking the pipe joint, reducing maintenance downtime on boilers, heat exchangers and pump inlets.
0.062-inch perforations handle typical steam
The 304 stainless screen stops particles larger than the stated perforation size, protecting seats and impellers in moderate-flow applications. At 15 gpm Cv the unit passes design flow with minimal restriction, but finer silt or high-velocity slurry will pass through or load the screen quickly. The 3/8-inch blow-off port cannot accommodate large-volume blowdown piping, so very dirty systems need supplementary filtration upstream.
How it compares
Measured against everything we stock in Pumps, Sprayers & Pump Accessories, at today’s prices. Recalculated every night.
- Price $230.99
- Pricier than about 82% of the 962 comparable items (median $38.99).
Specifications
| Product | |
|---|---|
| Brand name | MUELLER STEAM SPECIALTY |
Questions about this item
What is the maximum pressure this 581 CS Y strainer can handle at 100 degrees F?
The carbon steel housing is rated for 480 psi at 100 degrees F, with a maximum pressure of 1015 psi at the same temperature.
How much heat does the 304 stainless steel screen add during continuous steam service?
The perforated 0.062 in screen is passive; it adds no heat of its own and the strainer is rated for 100 degrees F maximum temperature.
What pipe connection must already be in place for this 1 in FNPT strainer to install?
A 1 in female NPT threaded pipe end is required on both the inlet and outlet to mate with the strainer's screwed ends.
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