$4.00
Two sizes one size fits 1/4 inch valves and one fits 3/8 valves. There are as many as 50 different diameters and thread sizes of orifices.  
Part #141372 for 1/4 orifice  and  Part# 381372 for 3/8 orifice,
ORIFICES SOLD WITH VALVES

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Orifices
Two sizes one size fits 1/4 inch valves and one fits 3/8 valves. There are as many as 50 different diameters and thread sizes of orifices.  
Part #141372 for 1/4 orifice  and  Part# 381372 for 3/8 orifice,
ORIFICES SOLD WITH VALVES