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Transparent spin-on HVAC filter with 3/4 inch thread

Baldwin Filters

Baldwin Filters B7221 HVAC Control Spin-On 3/4" Thread

SKU CH-XPBM-AZB5B

Spin-on oil filter with 3/4"-16 thread, 23-micron rating and built-in bypass valve

  • Product colorTransparent
  • 23 micron rating captures fine contaminants
  • 8 psid bypass valve maintains flow under pressure
  • Anti-drainback valve prevents dry starts
  • 3/4"-16 thread fits Lister-Petter LPA3A engines
  • Compact 2-9/16" height suits tight installations

Product identity

The Baldwin Filters B7221 is a spin-on HVAC control filter with a 3/4"-16 thread designed for equipment running a Lister-Petter LPA3A engine. It targets technicians and fleet operators who need a direct-fit replacement for scheduled lube service.

Build quality and daily use

The transparent housing shows a 23 micron element, an 8 psid front-end bypass valve and an anti-drainback valve, all built into a spin-on canister measuring 2-9/16" in height and 3-11/16" in diameter. The 3/4" thread allows quick hand installation during routine maintenance.

Upgrade context

This filter replaces the original equipment spin-on unit on Lister-Petter LPA3A power plants; the jump is worth it when the old canister reaches its service interval or shows pressure-drop symptoms. It does not suit engines with different thread pitches or micron requirements.

How it compares

Measured against everything we stock in Heating & Cooling Controllers, at today’s prices. Recalculated every night.

Price $8.99
Cheaper than about 91% of the 1,762 comparable items (median $45.99).

Specifications

Product
Brand nameBALDWIN FILTERS
Product colorTransparent

Questions about this item

What does the 3/4"-16 thread size mean for compatibility?

The 3/4"-16 thread size matches the mounting port on equipment using the Lister-Petter LPA3A engine, ensuring a direct fit without adapters.

What clearance is needed for the 2-9/16" height and 3-11/16" diameter?

You need at least 2-9/16 inches of vertical clearance and a 3-11/16 inch diameter opening to accommodate the spin-on canister body.

How do you install the spin-on filter and which step is often missed?

Lubricate the gasket with clean oil, thread the filter on by hand until the gasket contacts the base, then tighten an additional three-quarters to one full turn; the missed step is pre-lubricating the gasket.

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