ASAB DDP18 Replacement Parts #11 - PTFE Sealing O-Ring

Part Code: ASAB-SDDP18-11

Introducing the ASAB DDP18 PTFE Sealing O-Ring — a critical sealing component designed to restore leak-free performance in ASAB DDP18 Double Diaphragm Pump assemblies. Made from PTFE & Teflon for excellent chemical resistance, this sealing O-ring is used where you need dependable sealing against aggressive fluids, solvents, and harsh service conditions.

A worn, nicked, flattened, or chemically attacked sealing O-ring is a common cause of weeping at housings, air/fluid cross-leak symptoms, loss of prime, or inconsistent pump behaviour (depending on where it sits in the stack). Replacing the seal with the correct PTFE O-ring helps bring the pump back to stable, reliable operation and prevents minor leaks turning into major downtime.

Whether you’re doing a scheduled service, rebuilding a wet end, or chasing a small leak that’s doing your head in, the ASAB DDP18 PTFE Sealing O-Ring is the right part to keep your DDP18 sealing properly.

Key Benefits

• Direct replacement PTFE sealing O-ring for ASAB DDP18

• Excellent chemical resistance for solvents and harsh materials

• Helps prevent leaks and weeping at sealing interfaces

• Supports stable prime and consistent pump performance

• Ideal for service rebuilds and preventative maintenance

• PTFE material helps reduce swelling/softening seen with standard elastomers

• Workshop-ready spare for fast turnaround repairs

What’s Included

• DDP18 PTFE Sealing O-Ring — ASAB-SDDP18-11

Safety Check

• Isolate and depressurise first: Shut off air supply, bleed the air line, and ensure the pump is fully depressurised before opening any housings.

• Chemical exposure: Wear gloves and eye protection—residual product can remain trapped in the pump.

• Seal handling: PTFE can nick easily—keep it clean, don’t drag it across threads, and avoid sharp tools during fitment.

• Inspect sealing faces: Clean and check housings for scoring or damage that will cause repeat leaks even with a new O-ring.

• Reassemble evenly: Tighten fasteners in a cross pattern to avoid pinching the seal and creating a leak path.

• Test gradually: Bring air pressure up slowly and check for leaks before returning to full operating conditions.

ASAB – Engineered for Performance, Built to Last.