Aladdin O-305-9 tank o-ring for the Hayward C-250-F filterAladdin O-Ring for Hayward® C-250-F Tank, O-305-9 In stock$1399
Aladdin O-305-9 tank o-ring for the Hayward C-250-F filter
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Aladdin O-Ring for Hayward® C-250-F Tank, O-305-9

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$1399
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Quick overview

  • Aladdin part O-305-9 Aladdin numbers its seals in its own O series, so quote O-305-9 when matching.
  • For the Hayward® C-250-F tank Listed specifically for that filter tank, not as a universal ring.
  • Fixes a weeping tank seam A drip at the band clamp is almost always a flattened or nicked tank o-ring.
  • Replaced with the tank open It is the seal you reach anyway during a cartridge change, so it is a cheap thing to renew while you are in there.
  • Aftermarket seal Aladdin supplies replacement seals across pool equipment brands.
  • Lubricate before fitting Silicone lubricant, never petroleum, keeps the ring seated and lets the tank halves close evenly.
Full description and specifications ↓

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Product details

This is the Aladdin O-305-9, the replacement tank o-ring listed for the Hayward® C-250-F filter. It is the seal between the two halves of the filter body, held closed by the band clamp.

When it needs changing

The usual sign is water at the seam. A tank o-ring lives under constant compression and constant pressure cycling, and over a few seasons it takes a set, loses its spring and stops filling the groove. Once that happens the clamp can be torqued correctly and the tank will still weep. A nick from a stone or a ring pinched during a clumsy reassembly does the same thing much faster.

Fitting

Wipe the groove and the sealing face clean before the new ring goes in, since grit left behind will hold the joint open. Use a silicone lubricant, not a petroleum grease, and bring the clamp down evenly rather than tightening one side at a time.

Specifications
Brand Aladdin
Manufacturer part number O-305-9
Type Tank o-ring
Fits Hayward® C-250-F filter tank
Shipping weight 0.18 lb
Ships Parcel

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Questions and answers

What people ask about this product, answered by our pool techs.

What does this o-ring seal?
The tank on a Hayward® C-250-F filter, the joint between the two halves that the band clamp pulls together.
Is this a Hayward® part?
No. It is Aladdin part O-305-9, an aftermarket seal listed for the Hayward® C-250-F tank.
My filter drips at the clamp, is this the fix?
Usually. Water at the band clamp with the pump running points at the tank o-ring, either flattened with age, nicked, or pinched on the last reassembly.
Should I grease it?
Yes, with a silicone lubricant. Petroleum products swell and soften o-rings and will shorten the life of the seal.
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