Pentair FNS Plus Tank Bottom Assembly 36 sf | 170016
Pentair
SKU: 170016
Pentair 170016 Tank Bottom Assembly for FNS Plus 36 Sq Ft D.E. Filter (FNSP36)
The Pentair 170016 is an OEM replacement tank bottom assembly (lower tank half) for the Pentair/PacFab FNS Plus 36 sq ft vertical-grid D.E. filter, commonly referenced as FNSP36. This part forms the lower half of the filter tank and provides the base structure and sealing surface for the tank O-ring and clamp band.
Compatibility
- Fits: Pentair / PacFab FNS Plus 36 sq ft D.E. filter
- Common model reference: FNSP36
- Part type: Tank bottom / lower tank half assembly
Always verify your filter model and parts diagram before ordering. FNS Plus tank parts vary by filter size (24, 36, 48, and 60 sq ft).
What This Part Does
- Forms the lower half of the filter tank housing
- Provides the seating surface for the tank O-ring and clamp band connection
- Supports internal filter components and helps maintain a pressure-tight filter body
When to Replace the Tank Bottom
- Cracks, hairline fractures, or visible seepage from the lower tank shell
- Warping or damage that prevents proper sealing with the tank O-ring
- Damage at the clamp contact area from age, impact, UV exposure, or overtightening
- Persistent leaks after replacing the tank O-ring and confirming clean sealing surfaces
Installation Notes
- Turn off the pump and relieve all filter pressure before opening the filter.
- Inspect and replace the tank O-ring if it is flattened, cracked, swollen, or nicked.
- Clean all sealing surfaces thoroughly before reassembly.
- Reinstall the clamp band evenly and follow manufacturer tightening procedure (do not over-tighten).
- After restart, check for leaks once the system reaches full operating pressure.
Related Products (Aqua Pool Supply)
- Pentair 170016 Tank Bottom (Search)
- Pentair 170020 Tank Lid Assembly for FNS Plus 36 (Search)
- FNS Plus Tank O-Ring 39010200 (Search)
- FNS Plus Clamp Kit (Search)
- FNS Plus 36 Grid Assembly (Search)
Maintenance Tips
- Keep the tank O-ring clean and lightly lubricated with pool-safe silicone lubricant to reduce pinching and leaks.
- Never open the filter until the pressure gauge reads zero and air has been fully relieved.
- If the filter is in direct sun, shade can help extend the life of plastic tank components.
- Record your clean starting pressure after service so you can track when the filter needs cleaning.
Questions about returns? View our return policy.
Hours Of Operation:
Monday - Friday: 8:00 am to 4:00 pm Phoenix Time
Saturday and Sunday: Closed
- Orders costing more than $300 WILL be required to have signature confirmation upon delivery.
- Handling time is typically only 1 day.
- Any item ordered after 1pm Phoenix time, may not ship same-day.
- Call us if you require expedited shipping and we can give you quotes based on your needs.
Return Policy:
- All products, except as noted below, are eligible for return up to 30 days after receipt of item.
- For returns, an RMA form must be filled out HERE or customers can call for additional help.
- Shipping costs will be deducted from all returned items.
- Any item that is missing accessories, original packaging, or is not returned in the same condition that it was received in, may be subject to a re-stocking fee up to 100% based on the condition we receive it in.
- Items broken, damaged, or inoperable due to installer error will not be refunded.
- Fill out the return form or give us a call to obtain an RMA and return shipping label.
- There are no returns on the Pentair Colorsync 618031
- No returns on pool cleaners.
- No returns on opened seals and o-rings.
- No returns on capacitors.
- If a light is returned because it "doesn't work" and it tests fine, the cost to ship and a re-stocking fee will be deducted from the refund.
- All products denied upon arrival at customers house WILL be charged the cost to ship.
- Visa Gift Card Promotions: Gift cards are sent within 14 days of the order. When accepting the Visa Gift card, you agree that if your order is returned or refunded, this amount will be deducted from the refunded amount. All Visa Gift cards are sent via email in an E-Gift Card format and are non refundable.
Related Products
