BAPL-5396 has a description of TX1812E179 3.8GPM 2000PSI 1750RPM 1.125"

• Pump Model TX1810E179 TX1812E179 TX1512E179 TX1510E349
• Maximum Volume 3.2 GPM 3.8 GPM 2.6 GPM 4.0 GPM
• Maximum Discharge Pressure 2000 PSI 2500 PSI 3000 PSI
• Horsepower 4.4 EBHP 5.2 EBHP 5.3 EBHP 8.2 EBHP
• Maximum Pump Speed 1750 RPM 3400 RPM
• Maximum Inlet Pressure 125 PSI
• Minimum Inlet Pressure 3 Ft. Water (2.6 in. Hg)
• Plunger Bore .708 in. / 18 mm .591 in. / 15 mm
• Plunger Stroke .394 in. / 10 mm .472 in. / 12 mm .472 in. / 12 mm .394 in. / 10 mm
• Oil Capacity 14.0 oz.
• Maximum Fluid Temperature 1650 F
• Inlet Port Thread 1/2-14 BSPP-F
• Discharge Port Thread 3/8-19 BSPP-F
• Shaft Diameter 1.125 in. / 28.5 mm
• Weight 18 lbs.
• Dimensions 8.6” x 7.9 “ x 5.7

WARNING This product can expose you to chemicals, including Lead which are known to the state of California to cause cancer and birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.  As alarming as the proposition 65 warnings may appear, you can rest assured that the products we sell remain the same as in the past. We encourage normal hygiene and discourage placing any of our products in your mouth, as they are not intended for human consumption.