Genuine Midland Haldex Valve Relay brake parts P/N: KN28531, ready to ship worldwide! Call us with any questions.A factory handling fee of $25.00 per unit is added at checkout.FeaturesRG2 Relay ValveA fast relay used to apply and release service brakes on tractor or trailer.Cracking pressure: 5.6 +/- 1.0 PSI.Compact size.Control Port 1/4″.Two port delivery.Two mounting holes, .34 diameter on 1.50″ centers.Cover may be rotated without affecting warranty or performance.Approximate Weight: 1.5 lbs.Picture illustrates 90 control port position. 0 would locate port in line with delivery port “D”.Tech SpecsSupply A 1/2″Supply B 3/8″Delivery C 3/8″Delivery D 3/8″Control Position 0Plugs Included 1 @ 1/2″OEM Part Number N30108BHCore Group 225Width 3-1/2″Length 3-1/2″Height 3-5/8″Contol Port 1/4″Cracking Pressure 5.6 1.0 PSIMounting Holes (2) .34″ diameter on 1.50″ centersApproximate Weight 1.5 lbs.Additional InformationRepair Kit use part number RN10HM.