The heart of the classic ST Pro™ 495 system is the 243183 displacement pump—a Chromex-hardened workhorse rated at 3000 psi and 0.54 gpm max delivery. Because it drops into every 232943 Lo-Boy chassis built between 1999-2008, a single spare lower can rescue fleets scattered across multiple crews and counties.
Contractors in Houston, Phoenix, and Pittsburgh count on the 495’s rock-solid motor/pump combo to spray block-fillers one day and fine-finish enamels the next. The key is OEM tolerances: knock-off rods glaze packings in weeks, while Graco’s Chromex rods routinely last 750–1000 spray hours before repack
Five Reasons Pros Pick the 243183 Pump
- Chromex™ Rod & Stainless Sleeve – 6× longer life than economy steel lowers
- Quick-Change Packing Stack – swap V-Max™ Blue seals in under 20 min with QuikPak kits
- Self-Cleaning Prime Valve – Vibra-Seat design purges debris for no-stall startups
- Tool-Free Pump Removal – two hand-knobs release the lower; no hammers, no blown timelines
- Cross-Fleet Hardware – identical outlet threads match graco paint sprayer 395 & graco magnum xr7 parts, so you stock one filter family for all rigs
Key Performance Specs
- Maximum Working Pressure: 3000 psi / 207 bar
- Maximum Flow: 0.54 gpm / 2.05 lpm
- Max Tip Size (1-gun): 0.023 in
- Recommended Hose Length: 150 ft with minimal dead-band
- Motor: ¾ HP UL-listed universal, 120 V – brushes available as kit 236967
Which Machines Does the 243183 Pump Fit?
Direct bolt-on for:
- ST Pro 495 Lo-Boy (232943) & Stand (232940) sprayers
- ST Pro 455 & 395 when upgraded with 243183 kit (threads match drive rod)
- Legacy Ultra Max II 495 PC Pro – flows slightly higher (0.60 gpm) but shares suction & outlet geometry
- Graco paint sprayer 395 – identical Easy-Out™ filter & RAC X™ guard
Cross-Stock Parts for Mixed Fleets
Keep one bin of graco spray pump parts for your 495ST and Magnum XR7 rigs; the valves, outlet fittings, and suction O-rings are common across both platforms. Houston-area refinishers love this because one truck run to our Jones Road service counter covers commercial and DIY rentals in a single purchase.
Shop-Floor Hacks for 10-Year Pump Life
- Log hours, not months — Repack every 750–1000 spray hours; note the change in the graco paint sprayer parts diagram.
- Daily TSL Drip — Add one drop of Throat Seal Lubricant before each shift to cool packings.
- Color-Code Bins — Yellow for belts, red for packings, blue for graco paint sprayer attachments so night shifts grab the right box first-time.
- Carry a Spare Pump — The 243183 lower swaps in under 60 seconds—faster than mixing a second five-gallon pail.
- Flush Hot — End-of-day FastFlush™ mode (4× faster, half the water) from the Ultra Max platform works on ST Pro as well
Bundle & Save Freight
- 17H839 QuikPak™ Kit – one-piece cartridge rebuild for any ST-series pump
- 246215 RAC X™ Blue Guard – universal 7/8-G threads fit 495, 395, Magnum XR7 & TrueCoat guns
- 288818 Magnum XR Pump Kit – keeps rental fleets spraying while pros run ST Pro
- BlueMax II 1/4″ x 50′ Hose – crush-proof braid, static-dissipative per Graco bulletin 334530
All parts qualify for combined-cart shipping—one freight fee, one tracking number.
Same-Day Ship & Real Humans on the Phone
Qualified Orders placed before 12 and your box leaves Graco warehouse to you the same day.
Ready to Slash Downtime & Boost Margins?
Add the OEM Graco 495ST ProB Lo-Boy Pump 243183 to your cart now and feel the difference when tomorrow’s first trigger pull lays down glass-smooth coverage—no spits, no stalls, just profit.