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Two supply ports and five delivery points set the Bendix Air Brake Relay Valve's plumbing footprint for this configuration. The Bendix 801123's 4.0 psi crack pressure establishes the operating threshold, while the delivery side combines 3/8-18 and 1/4-18 NPT connections. The relay valve uses dual 1/2-14 NPT supply ports to feed that relay circuit. Brake-system buyers can therefore compare body layout, crack pressure, and connection sizes without reducing the choice to valve appearance alone.
| Balance / Primary Service Port | Not applicable to this part |
| Body Configuration | 2 SUP / 5 DEL (5H) |
| Cautionary Note(s) | Not applicable to this part |
| Control / Secondary Service Port | 1/4-18 NPT |
| Control Port Orientation (CW from Front Face) | Not applicable to this part |
| Crack Pressure | 4.0 PSI |
| Delivery Port 1 | 3/8-18 NPT |
| Delivery Port 2 | 3/8-18 NPT |
| Delivery Port 3 | 3/8-18 NPT |
| Delivery Port 4 | 3/8-18 NPT |
| Delivery Port 5 | 1/4-18 NPT |
| Delivery Port 6 | Not applicable to this part |
| Delivery Port 7 | Not applicable to this part |
| Delivery Port 8 | Not applicable to this part |
| Exhaust Port | Dust Shield |
| Internal Supply Passage to Cover | Not applicable to this part |
| Market Indicator | Aftermarket New |
| Maximum Operating Temperature | 200 AdegF (93 AdegC) |
| Minimum Operating Temperature | -40 AdegF (-40 AdegC) |
| Mounting | 3/8-16 UNC-2B (3x) |
| Mounting Bracket Direction | Not applicable to this part |
| Mounting Bracket Location | Not applicable to this part |
| Mounting Orientation (CW from Front Face) | 180Adeg |
| Supply Port 1 | 1/2-14 NPT |
| Supply Port 2 | 1/2-14 NPT |
| TMC Washer | RV040 |
| Country of Origin (Primary) | MX |
| UPC | 04068078305515 |
| VMRS Code | 013010009 |
| Brand | Part Number |
|---|---|
| BW801123 | |
| N/A | 5019003 |
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