The Midland Haldex KN28042 is a four-port, single control line relay valve used to apply and release service brakes on tractors and trailers. The supply (port 2) and delivery (port 4) connections are both 1/2-inch; the control (port 1) inlet is 1/4-inch. Crack pressure is 4.6 PSI. The valve cover can be rotated 360 degrees without affecting performance, making installation easier in tight brake system layouts. This multi-application valve crosses to several OEM numbers including N30100JA, N30100JB, N30100JC, N30100JD, and N30100JE. Bracket is not included. Repair kit RN10HK is available separately. A genuine Midland Haldex part from Pro Gear and Transmission. Call us to confirm fit for your specific tractor or trailer application.
Features
Four-port, single control line relay valve
Supply (port 2) and delivery (port 4): 1/2-inch connections
Control (port 1): 1/4-inch connection
Crack pressure: 4.6 PSI
Rotatable cover for flexible installation - no effect on performance
Crosses to OEM numbers N30100JA, N30100JB, N30100JC, N30100JD, N30100JE; bracket not included
Tech Specs
- Supply (Port 2): 1/2"
- Delivery (Port 4): 1/2"
- Control (Port 1): 1/4"
- Crack Pressure: 4.6 PSI
- OEM Part Number: N30100JD
- Bracket: Not included
