Made in USA
NS-Series piloted discharge check valves have a 22 SCFM rating. Available features include side and top inlets, an optional 1/4" muffler for quiet operation and multiple inlet/outlet combinations.

The NSG incorporates a hand unloader for manually unloading the compressor, and is usually used on gas engine applications.
Muffler & Manual Hand Unloader included on every valve we stock
N-Series
 Piloted discharge check valves in the N-Series have a 30 SCFM rating. They feature available side and top inlets, an optional 3/8" muffler for quiet operation and multiple inlet/outlet combinations.​
The NG incorporates a hand unloader for manually unloading the compressor, and is usually used on gas engine applications.
Muffler & Manual Hand Unloader included on every valve we stock
Available Inlets
FNPT: 1/4" 3/8" 1/2"
Comp: 3/8" 1/2" 5/8"
In Flare: 5/8"
MNPT: 3/8" 
Tubelok: 1/2"
JIC flare: #8

Available Inlets: 
FNPT: 3/8"  1/2" 3/4"
Comp: 3/8" 1/2" 5/8" 3/4"
In Flare: 1/2" 5/8"
MNPT: 3/8"
JIC flare: #10
OEM Replacement Discharge unloaders
​CAMPBELL HAUSFELD - RIGID - ST171400AV .......... NRO-NA-120-150
CAMPBELL HAUSFELD - ST128410AV ....................... NSG7-M 100-125
CAMPBELL HAUSFELD - ST128413AV ....................... NSG18-M 95-125
CAMPBELL HAUSFELD - ST128408AV ....................... NG17-M 140-175

HITACHI COMPRESSOR .............................................. NG42-M 110-140

INGERSOLL RAND - 49816283 .................................... NG13-M-P2 140-175
INGERSOLL RAND - 32262867 .................................... NG16-P2 145-175 - 5/8"

CHICAGO PNEUMATIC - 1312100497 ........................ NG20-M-SU4-14-SST 140-175

SPEEDAIR - MI-T-M - 22-0346 ..................................... NSG13-M 95-125
SPEEDAIR - MI-T-M - 22-0270 ..................................... NG29-M 145-175

QUINCY - 112711 ......................................................... NG3-M-NF1-P1 110-125
This is a list of a few popular OEM discharge unloader valves. each of these valves are readily available in our Atlanta whse. We will continue to add more OEM replacement valves to this website.