Fusible Plugs & Fusible Unions
Our Fusible Plugs and Fusible Unions are the highest quality in the HVAC/R market. They are available in Bulk Pack quantities, but also available in Single Packs which are popular with our Wholesale/Distributor customers.
FUSIBLE PLUGS
FUSIBLE UNIONS
| SIGMA PN | THREAD SIZE | MELTING TEMP | INDUSTRY STD PN |
|---|---|---|---|
| PLUG-110 | 1/8" MPT | 168° F | FP-A-168 |
| PLUG-148 | 1/8" MPT | 210° F | FP-A-210 |
| PLUG-153 | 1/4" MPT | 210° F | FP-B-210 |
| PLUG-175 | 3/8" MPT | 210° F | FP-C-210 |
| PLUG-166 | 1/8" MPT | 283° F | FP-A-283 |
| PLUG-421 | 1/4" MPT | 283° F | FP-B-283 |
| PLUG-337 | 3/8" MPT | 283° F | FP-C-283 |
| SIGMA PN | CONNECTIONS | MELTING TEMP | INDUSTRY STD PN |
|---|---|---|---|
| UNION-154 | 1/4" SAE X 1/4" MPT | 210° F | FU-4B-210 |
| UNION-184 | 3/8" SAE X 3/8" MPT | 210° F | FU-6C-210 |
| UNION-58 | 3/8" SAE X 1/2" MPT | 210° F | |
| UNION-319 | 3/8" SAE X 5/8"-18 UNF | 210° F | |
| UNION-44 | 1/4" SAE X 1/4" MPT | 283° F | FU-4B-283 |
| UNION-76 | 3/8" SAE X 3/8" MPT | 283° F | FU-6C-283 |
PRESSURE RELIEF VALVES
| SIGMA PN | CONNECTION 1 | CONNECTION 2 | PRESSURE SETTING | BODY STYLE |
|---|---|---|---|---|
| VALVE-58 | 3/8" MPT | 3/8" SAE | 350 PSI | ANGLE |
| VALVE-67 | 3/8" MPT | 3/8" SAE | 400 PSI | ANGLE |
| VALVE-771 | 3/8" MPT | 3/8" SAE | 450 PSI | ANGLE |
| VALVE-5026 | 3/8" MPT | 3/8" SAE | 600 PSI | ANGLE |
| VALVE-5033 | 3/8" MPT | 3/8" SAE | 675 PSI | ANGLE |
| VALVE-94 | 1/2" MPT | 5/8" SAE | 350 PSI | ANGLE |
| VALVE-102 | 1/2" MPT | 5/8" SAE | 400 PSI | ANGLE |
| VALVE-764 | 1/2" MPT | 5/8" SAE | 450 PSI | ANGLE |
| VALVE-5057 | 1/2" MPT | 5/8" SAE | 675 PSI | ANGLE |
| VALVE-5064 | 3/4" MPT | 3/4" FPT | 600 PSI | ANGLE |
| VALVE-5071 | 3/4" MPT | 3/4" FPT | 675 PSI | ANGLE |
| VALVE-5040 | 1/2" MPT | 5/8" SAE | 600 PSI | STRAIGHT |