Onga Pump Lid O-Ring - LTP / PPP / 400 / 600 / 900 Series - 702208

Name: Onga Pump Lid O-Ring - LTP / PPP / 400 / 600 / 900 Series - 702208
Brand: Onga
SKU: PA-592 / 702208
Price: 12.00 AUD
Availability: InStock

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Onga Pump Lid O-Ring

The o-ring that seals the screw-on strainer lid to the pump body on Onga LeisureTime, Pantera and the 400, 600 and 900 Series pumps. Replaces Onga part number 702208, also listed as 702208K. A flattened, perished or dried out lid o-ring is the most common reason an Onga pump will not prime or will not hold prime, because it draws air into the suction side rather than leaking water out.

Physically Stocked, unlike most "drop-shipping" websites.
Shipped from VIC, NSW, WA, QLD

Fits These Pumps

Onga LeisureTime LTP

LTP 400, LTP 550, LTP 750, LTP 1100

Onga Pantera PPP

PPP 550, PPP 750, PPP 1100, PPP 1500, PPP 1500H

Onga series pumps with the screw-on lid

400 Series, 600 Series and 900 Series, the housings that take the 165mm screw-on lid
BR Series

Onga is now part of Pentair, so the same pumps and the same parts are sold under both the Onga and Pentair names.

Part Numbers and Search References

702208 (Onga part number)
702208K
PA-592
Size: approximately 147mm diameter with a 7mm section

Lid O-Ring Or Casing O-Ring?

These pumps use two different o-rings and they are not interchangeable:

Lid o-ring, 702208. This part. It sits in the groove on the clear strainer lid and seals the lid to the pump body. You can see it as soon as you unscrew the lid.

If The Lid Itself Is Cracked

A new o-ring will not seal against a lid that is crazed, cracked or distorted around the sealing rim. In that case order the complete Onga LTP/PPP pump lid, supplied with its o-ring.

Fitting Notes

Clean the groove in the lid and the sealing face on the pump body before fitting. Grit on the face leaks air just as a worn o-ring does.
Lubricate with a silicone-based o-ring lubricant only. Petroleum jelly and mineral greases swell the rubber and destroy it.
Hand tighten the lid only. These lids seal on the o-ring face, not on thread tension. Levering the lid around with a tool or a strap wrench cracks the lid and does not improve the seal.
If the lid is hard to turn, lubricate the o-ring rather than forcing it. A dry o-ring grabs.

Symptoms Of A Failed Lid O-Ring

Pump will not prime, or loses prime after it shuts down
Air bubbles visible in the strainer housing while the pump is running
Air coming back to the pool through the returns
Water weeping from under the lid when the pump stops
An o-ring that has gone hard, square sectioned, cracked or sticky

Running a pump that is drawing air in past the lid will eventually damage the mechanical seal, so a leaking lid o-ring is worth attending to promptly.

Related Onga LTP and PPP Parts

Not Sure Which One You Need?

Send us a photo of your pump label and the old o-ring and we will confirm the part before you order. Contact us if unsure.

Common search terms: Onga 702208, 702208K, Onga pump lid o ring, Onga LTP lid o ring, LTP400 LTP550 LTP750 LTP1100 lid seal, Pantera PPP550 PPP750 PPP1100 PPP1500 lid o ring, Onga 400 600 900 series lid o ring, BS431 o ring, PA-592, Onga pump not priming air leak, Pentair Onga lid seal.

To the layperson, plumbing sizes and their names can be confusing due to the nominal sizes and naming conventions used.

This is not something we made up. Plumbers and manufacturers have used nominal (meaning ‘by name only’) sizing for decades.

Simply put, in plumbing, named sizes are often not the actual measurements of the pipe, fitting, or part. A PVC pipe called “50mm” or “2"” does not measure 50 mm anywhere. Instead, it follows nominal sizing, an internationally-standardised naming system.

Almost all fittings we use in the pool & spa industry use “pressure PVC” pipe & fittings. Do not confuse with “DWV” or other pipe & fittings and their names and sizes.

Use the Outside Diameter (OD) to check your pipe against fittings. Below is a quick reference for common spa & pool pipe sizes:

Imperial Name	Metric Name	Pipe Diameter (OD)
1/2"	15mm	~21.2–21.5 mm
3/4"	20mm	~26.6–26.9 mm
1"	25 mm	~33.4–33.7 mm
1.5"	40 mm	~48.1–48.4 mm
2"	50 mm	~60.2–60.8 mm
2.5"	65 mm	~75.2–75.5 mm

To reiterate, these are nominal sizes and are designed to fit matching fittings — not to measure what their name suggests. These are based on PVC Pressure Pipe AS/NZ 1477 Dimensions^1.

º Internal diameters vary slightly by manufacturer and class.
¹ Not all pool/spa fittings match these dimensions exactly. Some do not follow Australian or international standards. Chinese spas may use proprietary fittings.

Understanding Plumbing Sizes & Nominal Measurements

Plumbing sizes can be confusing. PVC and many other pipe systems use nominal sizes—the size is a name, not the exact measured dimension. This convention is used across most pool and spa systems and other plumbing areas so that pipes and fittings remain compatible.

Quick example: A 2" / 50 mm fitting is named for the pipe it connects to, but the pipe’s actual outside diameter (OD) is approx. 60.3 mm (typically ~60.2–60.5 mm in AS/NZ pressure pipe).

Another example: a 2” / 50mm o-ring may refer to a barrel union, etc that suits 50mm pipe. Eg: a “50mm Balboa Gasket” refers to a heater gasket that measure 74mm across, but suits a Balboa barrel union made for 50mm pipe (and the 50mm pipe does not measure 50mm either!)

Why pipe sizes don’t match the measurements

The Nominal Pipe Size (NPS) system standardises pipe dimensions so that pipes, fittings, valves, and accessories interoperate.

Plumbers work with these nominal names every day, but DIYers can be tripped up if they try to match by a tape-measure alone.

How to Measure Pipe Correctly

Pipe size is identified by:
- The pipe’s Outside Diameter (OD).
- The fitting’s Inside Diameter (ID) (socket opening).
Pipe Class / Schedule (e.g., Class 9, 12, 18 or Sch 40) relates to wall thickness and therefore the Internal Diameter (ID) and pressure rating.
The outside diameter of a fitting is not useful (wall thickness varies by manufacturer).

Important: For pool/spa work, most plumbing uses Pressure Pipe (AS/NZ standards) — not DWV. Always check OD and the pipe class against your equipment specifications.

Hose & Tube Dimensions

Common flexible hose sizes used in pool/spa systems (approximate IDs).

Imperial Name	Metric Name	Inside Diameter (ID)
3/8"	9–10 mm	~9 mm
3/4"	19 mm	~19 mm

BSP – British Standard Pipe Thread Sizes

BSP thread names are also nominal. The thread OD will not equal the nominal name.

BSP Thread Size Naming	Outside Diameter (mm / inch)	TPI
1/16" BSP	7.7 mm / 0.304"	28
1/8" BSP	9.7 mm / 0.383"	28
1/4" BSP	13.16 mm / 0.518"	19
3/8" BSP	16.66 mm / 0.656"	19
1/2" BSP / 15 mm	20.99 mm / 0.825"	14
5/8" BSP	22.99 mm / 0.902"	14
3/4" BSP / 20 mm	26.44 mm / 1.041"	14
7/8" BSP	30.20 mm / 1.189"	14
1" BSP / 25 mm	33.25 mm / 1.309"	11
1-1/4" BSP	41.91 mm / 1.650"	11
1-1/2" BSP / 40 mm	47.80 mm / 1.882"	11
2" BSP / 50 mm	59.61 mm / 2.347"	11
2-1/4" BSP	65.71 mm / 2.587"	11
2-1/2" BSP	75.18 mm / 2.960"	11
3" BSP	87.88 mm / 3.460"	11
4" BSP	113.03 mm / 4.450"	11
5" BSP	138.43 mm / 5.450"	11
6" BSP	163.83 mm / 6.450"	11

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PA-592 / 702208