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R-14H relay valve:
1. Supply Port: 1, 1/2in P.T.
2. Delivery port: 2, 1/2 in P.T.
3. Control Port: 1, 1/4in P.T.
4. Balance Port: 1, 1/8in P.T.
5. 6 psig Cracking Pressure
some parts number reference:
PAI/EXCEL: LRV-3579
MID: KN28065
it is suited for Mack truck, and exported to USA, CANADA, Center American market