Engine Part # 1-0231 (prev known as 1-0198) is for models:

Increased spray consistency

All motors feature ball-bearing construction

It is a replacement fluid needle for the MBC 510 Spray Gun's fluid needle

MITM 850-0174 R1 50-foot x 3 ⁄8-inch ID 2500 PSI Hot Water Extension Hose w/ Screw Connects, Swivel & Bend Restrictors cabdim_60x24 Engine Part # 1-0231 (prev850 0174 R1 2500 50' x 3 8", hot water extension hose, also fits HSP models When you need extra mobility and length 2500 PSI, R1 50 foot x 3 8 inch I. D. 250F temperature rating For use with hose reels Includes screw connects, swivel and bend restrictors Chemical resistant Wire braided