Guardian™ Purifier Parts

$158.37 ~~$239.95~~ In stock

Keep your MSR Guardian purifier performing at its best with genuine replacement parts. This collection includes essential components for maintenance and repair, ensuring your water purification system stays reliable in the field.

Purifier Replacement Cartridge: Replace the filter cartridge to maintain effective purification.
Piston Assembly: A key component for the pump mechanism, ensuring smooth operation.
Piston Nut: Secures the piston assembly in place for proper function.
Pump Housing: Durable housing that protects the internal pump components.
Prefilter & Hose Assembly: Includes the prefilter and hose to keep water flowing cleanly.

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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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Delivery costs

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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)

David ★★★★★ Oct 13, 2026

The replacement seal kit fit perfectly and stopped the slow drip I'd been fighting on my purifier. Genuine parts make a difference — the o-rings seated better than the generic ones I tried last year. Back to clean water on every trip now.

Daniel ★★★★★ Sep 15, 2026

After two seasons of backcountry trips my purifier started leaking at the pump, and this kit had everything I needed to fix it in one go. The seals fit tight and the pump feels smooth again, just like when it was new. Way cheaper than replacing the whole unit.

Hannah D. ★★★★★ Sep 13, 2026

After a full season of backcountry trips my purifier started losing pressure, and swapping in these genuine parts fixed it right up. The seals seated perfectly and it pumps like it did on day one.