Walchem's N11SHH Head Assembly for Walchem EWN-B11, SH-H metering pumps 
  - Head Material - 316 | Stainless Steel
- Fitting Material - 316 | Stainless Steel
- Seal Material - 316 | Stainless Steel
 PTFE | Teflon
- Ball Material - C22 | Hastelloy-C
- Diaphragm Material - PTFE | Teflon
- Tubing Material - LDPE | Low Density Polyethylene