ENVIRONMENTALLY FRIENDLY WATER SOLUBLE SOCKET WELD SPACERS Quick, Easy, Economical Just drop in a "SHUR-GAP" spacer, slide in the pipe, and weld. Minimum cost per joint. No "Third Hand" Needed "SHUR-GAP" spacers easily set the 1/16" minimum gap required by ANSI 31.1, Section III, ASME, US Navy & Military Codes. Dissolves Completely "SHUR-GAP is made of water-soluble dots that completely dissolve away. The water soluble wafer style holds in place and acts as an absorbent to dissolve the paper completely. Saves Time & Money "SHUR-GAP" spacers save 90% of the fit-up time and thousands in cracked weld repairs. Tube Header Set-In Connections : Sizes Available "SHUR-GAPs " are made to fit all common pipe and tube sizes from 1/2" to 4-1/2"