1 in. Brass Inline Check Valve, Buna-N | 944405
1 in. Brass Inline Check Valve, Buna-N | 944405
✓ In stock at our distribution warehouses — typically ships within 1–2 business days.
Flat-rate shipping, nationwide- Orders under $100: $9.95
- $100 – $499.99: $14.95
- Orders $500+: quoted — real freight for your order, not a flat guess
Volume order or crossing a competitor part number? Request a quote — usually answered the same business day.
The 1 in. brass inline check valve (part 944405) provides compact, spring-loaded backflow prevention with a Buna-N (NBR) soft seat for bubble-tight shutoff. Rated 400 psi WOG with a low 1/2 psi cracking pressure, polyetherimide disc, and a patented disc guide that prevents side loading. Female NPT both ends. Made in Italy.
Technical Specifications
| Manufacturer Part Number (MPN) | 944405 |
| Nominal Size | 1 in. |
| Valve Type | Inline check valve (spring-loaded poppet), brass |
| End Connections | Female NPT × Female NPT |
| Pressure Rating | 400 psi WOG |
| Temperature Range | +10°F to 210°F |
| Cracking Pressure | 1/2 psi |
| Seat / Seal | Buna-N (NBR) — water, oils, general purpose |
| Disc | Polyetherimide — corrosion and abrasion resistant |
Dimensions
| Bore Diameter | 0.66" |
| Weight | 0.71 lb |
Materials of Construction
| Body & End Connection | Brass |
| Disc | Polyetherimide |
| Seat | NBR (Buna-N) |
| Spring | Stainless Steel |
Performance & Testing
- Low 1/2 psi cracking pressure — opens with minimal upstream pressure
- Spring-loaded for fast seating; perfect seating at both high and low pressure
- Patented disc guide prevents side loading — stable, chatter-resistant operation
- Compact, high-capacity design with a head-loss-minimizing flow profile
- Not lead-free — for potable water supply lines, choose a lead-free certified valve (see Lead-Free Valves in our Valves menu)
Other Sizes in This Series
Brass Inline Check Valve, Buna-N, Female NPT (1/4"–4"; 400 WOG through 2", 175 WOG above). Jump to another size or add it straight to your cart:
| Size | Part # | Price | Cart |
| 1/4 in. | 944401 | $17.99 | Add to Cart |
| 3/8 in. | 944402 | $19.99 | Add to Cart |
| 1/2 in. | 944403 | $20.99 | Add to Cart |
| 3/4 in. | 944404 | $29.99 | Add to Cart |
| 1 in. (this page) | 944405 | $37.99 | — |
| 1-1/4 in. | 944406 | $55.99 | Add to Cart |
| 1-1/2 in. | 944407 | $85.99 | Add to Cart |
| 2 in. | 944408 | $120.99 | Add to Cart |
| 2-1/2 in. | 944409 | $283.99 | Add to Cart |
| 3 in. | 944410 | $355.99 | Add to Cart |
| 4 in. | 944411 | $630.99 | Add to Cart |
Typical Applications
Backflow prevention on water distribution, pump discharge, compressed air, and light oil lines; recirculation loops and gravity-fed systems where the 1/2 psi cracking pressure matters; general-purpose industrial and irrigation service. Not for potable water supply (not lead-free).
Cross-References & Interchange
Replacing another brand's 1 in. brass inline check valve? Match nominal size, end connections, cracking pressure, and pressure rating for a direct fit — or send us your part number and we will confirm the interchange. Pumping fuels or hydrocarbons? The 1 in. Viton-seal version (944405V) handles fuels and runs to 325°F. Corrosive chemicals? Step up to the 1 in. 316 SS inline check valve (949405).
Availability
In stock — ships direct from the manufacturer, typically 1–3 business days.
Technical Resources
- Check Valve Types Explained (Swing vs. Spring vs. Wafer)
- How to Choose the Right Valve
- Valve Pressure & Temperature Ratings Chart
Expert Guides for This Product
- Check Valve Orientation & Installation — flow direction and mounting rules
- Check Valve Sizing Guide — why line size isn't valve size
- Slamming & Water Hammer — causes and fixes
- Check Valve Leaking? — diagnose and fix it
- Check Valve Chattering — the sizing problem nobody checks
- Buna vs. Viton Seats — which elastomer fits your media