Finish Thompson
UCR/UCP ANSI sealless pumps, AK/AV/VKC/MSVKC vertical mag-drive, and DB Series drum pumps — real specs and chemical compatibility, as stocked and specified by LibertyCES.
What LibertyCES specifies from Finish Thompson
ANSI drop-in compatible sealless pumps — pure ETFE containment (UCR) or ETFE-lined ductile iron (UCP). 8 of 10 harsh-chemical-service failures trace to seal failure or misapplied materials; sealless removes that failure point.
Vertical sealless mag-drive for sump, tank, and pit service. Titanium and Hastelloy C available as a premium wetted tier for oxidizer service.
Under the Finish Thompson umbrella
Air-operated double diaphragm pumps, FT025 through FT30P. The FT30P is a 3-inch polypropylene AODD pump rated to 300 gpm and 120 psi max air supply, with bolted construction and a stall-resistant air valve that eliminates separate pilot valves — designed for aggressive chemical transfer, not general utility duty.
MTD and related filtration pump systems, independently confirmed for acid transfer service. Dedicated page and catalog PDF in progress.
A Transfer Point Is a Containment Point
Bolted construction with precision-molded liquid chambers, a stall-resistant air valve that eliminates separate pilot valves, and fewer parts overall — fewer wear points on an aggressive chemical, and fewer places for a leak to start. Polypropylene is the body; the diaphragm and seat material is where the actual chemical-compatibility specification happens, and the temperature limit follows the selected elastomer, not a single blanket rating.
Finish Thompson — Real Catalog Spec Data
| Product Line | Model | Category | Material | Size / Capacity | Temp Rating |
|---|---|---|---|---|---|
| DB Series | DB3 | Pump | Polypropylene or PVDF | 20 ft head / 15 gpm (60Hz) | PP 180F / PVDF 220F |
| DB Series | DB4 | Pump | Polypropylene or PVDF | 29 ft head / 18 gpm (60Hz) | PP 180F / PVDF 220F |
| DB Series | DB5 | Pump | Polypropylene or PVDF | 35 ft head / 19 gpm (60Hz) | PP 180F / PVDF 220F |
| DB Series | DB5.5 | Pump | Polypropylene or PVDF | 31 ft head / 30 gpm (60Hz) | PP 180F / PVDF 220F |
| DB Series | DB6 | Pump | Polypropylene or PVDF | 33 ft head / 40 gpm (60Hz) | PP 180F / PVDF 220F |
| DB Series | DB6H | Pump | Polypropylene or PVDF | 54 ft head / 42 gpm (60Hz) | PP 180F / PVDF 220F |
| DB Series | DB7 | Pump | Polypropylene or PVDF | 34 ft head / 69 gpm (60Hz) | PP 180F / PVDF 220F |
| DB Series | DB8 | Pump | Polypropylene or PVDF | 45 ft head / 61 gpm (60Hz) | PP 180F / PVDF 220F |
| DB Series | DB9 | Pump | Polypropylene or PVDF | 67 ft head / 46 gpm (60Hz) | PP 180F / PVDF 220F |
| DB Series | DB10 | Pump | Polypropylene or PVDF | 51 ft head / 96 gpm (60Hz) | PP 180F / PVDF 220F |
| DB Series | DB11 | Pump | Polypropylene or PVDF | 74 ft head / 116 gpm (60Hz) | PP 180F / PVDF 220F |
| DB Series | DB15 | Pump | Polypropylene or PVDF | 98 ft head / 136 gpm (60Hz) | PP 180F / PVDF 220F |
| DB Series | DB22 | Pump | Polypropylene or PVDF | 201 ft head / 221 gpm (60Hz) | PP 180F / PVDF 220F |
| SP Series | SP10 | Pump | Polypropylene or PVDF | 63 ft head / 55 gpm (60Hz); self-priming, lifts 25ft | PP 180F / PVDF 220F |
| SP Series | SP11 | Pump | Polypropylene or PVDF | 68 ft head / 104 gpm (60Hz); self-priming, lifts 25ft | PP 180F / PVDF 220F |
Sourced from Finish Thompson's own catalog documentation.
FT30P: Finish Thompson's 3-inch polypropylene diaphragm pump
The FT30P is the largest pump in Finish Thompson's FTI Air non-metallic AODD line, launched March 2026: 300 gpm at 120 psi inlet air, 0.5-inch solids, polypropylene wetted parts, about 140 lb, and a stainless-steel air valve with no separate pilot valve. FTI Air backs it with a five-year warranty.
Pair it with Finish Thompson mag-drive and drum pumps on the same chemical package, and size it with our free diaphragm pump sizing calculator.
MSDB: run-dry tolerance and flooded suction, same pump
The MSDB is Finish Thompson's multistage sealless mag-drive for high-head, low-flow chemical service — up to about 306 ft (MSDB3, 60 Hz). With a carbon bushing it tolerates occasional dry running, but it is not self-priming, so suction design still decides pump life.
Our six-page checklist covers the bushing limits, the 2 ft NPSH margin and every suction-piping rule from the manual.
Size it right before you buy
The Finish Thompson MSDB pump-review checklist: carbon-bushing run-dry limits, NPSH margin and the suction-piping rules that decide pump life.
Enter flow, head, SG and plant air. See the air pressure and SCFM your duty needs on a real FTI Air FT30P curve, then get the worksheet by email.
Frequently Asked Questions
What is the difference between Finish Thompson UCR and UCP pumps?
UCR uses pure ETFE containment, is ANSI drop-in compatible, and handles up to ~250°F. UCP uses ETFE-lined ductile iron with optimized hydraulics and a snap-fit impeller for simplified service, rated to ~180°F.
Are FTI Air and Filter Pump the same company as Finish Thompson?
Yes — both are independently-branded divisions of Finish Thompson, each with their own product catalog and identity, covering AODD pumps (FTI Air) and filtration systems (Filter Pump) respectively.
What chemicals are Finish Thompson sealless pumps rated for?
Sodium hypochlorite is confirmed across both the UCR/UCP horizontal line and the AK/AV/VKC/MSVKC vertical line. PFA, PTFE, and ETFE liners are confirmed for phosphoric and nitric acid service.
What are the specs on the Finish Thompson FT30P AODD pump?
The FT30P is a 3-inch air-operated double-diaphragm pump with polypropylene wetted parts, rated to 300 gpm maximum flow, 120 psi maximum air supply, and 0.5-inch maximum particle size. Operating temperature is determined by the selected diaphragm material rather than a single blanket rating — eight diaphragm materials are available (Neoprene, Santoprene, FKM, EPDM, PTFE, Buna, Hytrel, and polyurethane), with polypropylene or PVDF seats.
Which Finish Thompson pump fits your chemistry and duty?
Ready to buy or need a fast answer? Call, text, or email James directly — (559) 395-5500 · james@libertyces.com.