PARTS · DIAPHRAGMS
Pump Diaphragms for Metering & Dosing Pumps
PTFE, EPDM, Viton and Santoprene pump diaphragms for LMI, ProMinent, SEKO, Milton Roy and Pulsafeeder metering pumps. Direct replacement parts at factory-direct prices.
Key Specifications
| Material | PTFE / EPDM / Viton / Santoprene |
| Thickness | 0.8–4.0 mm |
| Size range | 25–200 mm diameter |
| Compatibility | LMI, ProMinent, SEKO, Milton Roy, Pulsafeeder |
| MOQ | 1 piece (sample order welcome) |
Brand Diaphragm Guides
- ✓ LMI Liquifram guide — size codes for A, AA, B, C and P series, SP kit part numbers and LE liquid-end compatibility.
- ✓ SEKO Tekna & Tekna EVO guide — diaphragm part numbers (EM99106975 / EM00050017…) by pump model, with rebuild parts.
- ✓ ProMinent Gamma guide — spare parts kit order numbers (1023109 / 1035332 / 1030353…) for gamma/ X and XL by pump type and material code.
- ✓ Pulsafeeder PULSAtron guide — KOPkit contents and diaphragm kits by head size (PUL-5PKDIA4 for size #4), with model-code decoding.
Why Buy from DOSEPARTS
- ✓ Direct replacement parts — dimensionally identical to OEM
- ✓ Factory-direct pricing with sample orders welcome
- ✓ Ships worldwide, express dispatch available
- ✓ Free parts-matching support — send us your pump model
Frequently Asked Questions
How do I choose the right diaphragm material?
Match the chemical you dose: EPDM suits mild chemicals and water, Viton suits aggressive solvents, PTFE is the most chemical-resistant. Check your pump manual for the OEM spec.
How often should a metering pump diaphragm be replaced?
Typical service life is 6–12 months depending on chemical aggressiveness and duty cycle. Replace it when you see output drop or visible wear.
Are your diaphragms OEM or compatible?
We supply both OEM and high-grade compatible parts. Compatible parts are dimensionally identical and tested to the same pressure ratings.
Need the Right Pump Part Fast?
Factory-direct pricing on compatible diaphragms, valve cartridges, PMK kits and liquid ends for LMI, ProMinent, SEKO, Milton Roy and Pulsafeeder pumps. Send your pump model and get a quote within 24 hours.