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Pentair

Shurflo PRO BLASTER II Washdown Pumps Series 4248/4258

Pentair Shurflo PRO BLASTER II Washdown Pumps Series 4248/4258 — Marine Washdown Pump (Deck Cleaning).

Components & Design

Component data being added…

Technical Data

Type Positive Displacement Diaphragm Pump
Flow Rate 4.0 GPM (Deluxe), 5.0 GPM (Ultimate)
Pressure 60 PSI
Voltage 12VDC, 24VDC
Self-Priming Yes, up to 6 feet
Features Unique over-molded single-piece diaphragm

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Common failures & inspection points

Diaphragm material degradation and elastomer hardening in positive displacement pumps

Visual inspection of diaphragm flexibility; perform manual pump actuation resistance test; check for visible cracks, brittleness, or discoloration indicating UV/thermal damage

Impeller cavitation damage and erosion in centrifugal pumps operating at high flow rates

Visual inspection of impeller blade surface for pitting, erosion patterns, or surface roughness; measure suction inlet pressure; verify inlet filtration (raw water strainer) cleanliness

Corrosion and salt crystal formation in seawater-exposed pump housings and shafts

Inspect pump body, shaft sleeve, and bearing areas for white/green corrosion deposits; perform salt spray test sample verification; check stainless steel (316) shaft sleeve condition

Mechanical seal leakage and bearing wear in continuous-duty bilge/livewell pumps

Monitor fluid level around seal cavity; measure seal leakage rate; inspect bearing endplay with feeler gauge; listen for abnormal grinding or squealing noises; verify grease-for-life bearing integrity

Pressure switch calibration drift and electrical contact corrosion in marine environments

Test cut-in and cut-out pressure points with independent gauge against pump datasheet specs; inspect electrical contacts for green/white corrosion; verify 12-24V DC circuit continuity and insulation resistance

Type-general inspection and maintenance points for this equipment category — not model-specific.

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Equipment Model #149938 · ✓ still in production