Pentair Valve Stem / Shaft O-Ring (O-47) | JV18
The Pentair JV18 is a replacement valve stem/shaft O-ring (commonly referenced as O-47)
used on select Pentair valves and filter valve assemblies. This small seal helps prevent leaks and air intrusion around
the moving shaft/stem area, restoring smoother operation and more reliable sealing when the original O-ring becomes
flattened, brittle, swollen, or nicked.
Common Applications
- Pentair side-mount multiport valves (where the parts list specifies JV18 / O-47)
- Pentair PVC slide valves (where specified)
- Pentair SM / SMBW 2000 Series filter valve assemblies (rotor/valve assemblies where JV18 is listed)
- Other Pentair equipment that calls out JV18 for the shaft/stem O-ring position
Key Features
- Stops seepage around the valve stem/shaft area when the existing O-ring is worn.
- Helps prevent air leaks that can cause bubbles, loss of prime, or inconsistent operation on some systems.
- Direct replacement for the JV18 O-ring locationsimple, inexpensive maintenance part.
- Common cross-reference: often listed as O-47 (naming varies by catalog and supplier).
Specifications
- Brand: Pentair
- Part Number: JV18
- Part Type: Valve stem/shaft O-ring
- Common Reference: O-47 (cross-reference)
- Quantity: Sold individually
When to Replace
- Dripping or moisture around the valve stem/shaft area
- Valve feels grabby or doesnt move smoothly after lubrication/cleaning
- O-ring is visibly cracked, flattened, swollen, or nicked
- Seepage begins after seasonal service or after disassembly/reassembly
Installation Notes
- Turn off the pump and relieve system pressure before servicing any valve.
- Remove the stem/shaft component as required for your specific valve design.
- Clean the O-ring groove and sealing surfaces before installing the new O-ring.
- Lightly lubricate with silicone pool lubricant (never petroleum-based) and seat evenly without twisting.
- Reassemble and check for leaks under normal operating pressure.
Related Products
- Search Aqua Pool Supply for JV18
- Silicone lubricant for O-rings and seals
- Multiport valve O-rings and seals
- Slide valve seals and O-rings
Maintenance Tips
- Replace small stem/shaft O-rings proactively during valve serviceold seals often fail shortly after reassembly.
- Use only silicone-based lube in light amounts; too much lubricant can attract debris and accelerate wear.
- Keep valve areas clean and protected from direct sun when possible to extend the life of rubber seals.
- If leaking continues after O-ring replacement, inspect the stem/shaft and bore for scratches or wear that can prevent sealing.
