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Precision Works K Series Filler Neck Upgrade For Upper Coolant Housing For K20

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$60.39 $99 In stock

Category: Motor Vehicle Parts

Precision Works K-Series Filler Neck Upgrade

Upgrade a non-integrated filler neck upper coolant housing to an optional filler neck.

Fitting is 16AN for AN fitting radiator hose.

  • Works with Precision Works K20 Upper Coolant Housing with Hose Fitting
  • Uses Type B radiator cap.
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Standard Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

Express Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

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Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

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Returning an item

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United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

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Customer Reviews (4.8 / 5 · 5 reviews)

Penelope I. ★★★★★

Swapping out the stock plastic cap for this CNC-machined filler neck was a straightforward job, and I can already see the peace of mind it brings with the 16AN fitting. The machining is clean and the O-ring seals perfectly, no leaks on my K-swap so far.

George ★★★★★

Swapping my stock housing for this 16AN upgrade took maybe twenty minutes, and the threaded fitting seats so snugly I didn't even need extra sealant. Coolant temps have been steady on track days, and the extra port makes bleeding the system far less of a headache.

Miles C. ★★★★★

I’ve been running this 16AN filler neck on my K-swapped Civic for a few weeks now, and the machining is spot-on—no leaks or fitment issues. It’s a simple upgrade that makes burping the cooling system way less of a hassle.

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