# Emerson Fisher 1D884799012
>
> Type: ENVIRO‑SEAL Bellows Stem & Bellows Assembly, 3/4″ stem, for Fisher ET / EZ / ED Easy‑E control valve
> This is the metal bellows zero‑emission stem assembly (alternative to PTFE packing set 1R290401012 you checked before)
## Weight
**1.15 kg (2.53 lb)**
## English Specification
1. **Function**
Primary zero fugitive emission stem sealing assembly, all‑metal welded bellows structure, eliminates stem packing leakage. Suitable for toxic, volatile, hazardous fluid service. It combines valve stem + multi‑convolute welded bellows as one integrated spare assembly.
2. **Stem Size**
3/4 inch (19.1 mm) stem
3. **Material**
– Stem: 316 Stainless Steel
– Bellows: Hastelloy C276 (welded multi‑ply convolution bellows)
4. **Applicable Valve**
Fisher ET, EZ, ED Easy‑E sliding‑stem control valve, ENVIRO‑SEAL bellows bonnet configuration
>
> Distinction: 1R290401012 = PTFE live‑loaded packing set; **1D884799012 = bellows stem assembly (zero emission bellows type)**
5. **Temperature Rating**
-50 ℃ ~ +425 ℃ (-58 ℉ ~ +797 ℉)
6. **Pressure Rating**
Matched to CL600 / PN100 ET/EZ/ED valve bonnet